{"id":"CVE-2021-25217","aliases":["ALPINE-CVE-2021-25217","AZL-6372","CLSA-2021-1623075541","CLSA-2021-1634922551","CLSA-2021-1635459208","DEBIAN-CVE-2021-25217","DLA-2674-1","EUVD-2021-12128","GHSA-pf98-cx5w-r49r","MGASA-2021-0307","OESA-2021-1226","RHSA-2021:2357","RHSA-2021:2359","RHSA-2021:2405","RHSA-2021:2414","RHSA-2021:2415","RHSA-2021:2416","RHSA-2021:2418","RHSA-2021:2419","RHSA-2021:2420","RHSA-2021:2469","RHSA-2021:2519","RHSA-2021:2555","RLSA-2021:2359","SUSE-SU-2021:14740-1","SUSE-SU-2021:1822-1","SUSE-SU-2021:1841-1","UBUNTU-CVE-2021-25217","USN-4969-1","USN-4969-2","openSUSE-SU-2021:0834-1","openSUSE-SU-2021:1841-1","openSUSE-SU-2024:10715-1"],"status":"published","title":"A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient","description":"In ISC DHCP 4.1-ESV-R1 -\u003e 4.1-ESV-R16, ISC DHCP 4.4.0 -\u003e 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.","severity":{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-07","score":0.06118,"percentile":0.93478,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-119"],"published":"2021-05-26T00:00:00Z","modified":"2026-10-24T10:31:04Z","fixes":[{"ecosystem":"Alpine:v3.12","package":"dhcp","fixed_in":["4.4.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"dhcp","fixed_in":["4.4.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"dhcp","fixed_in":["4.4.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"dhcp","fixed_in":["4.4.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"dhcp","fixed_in":["4.4.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"dhcp","fixed_in":["4.4.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"dhcp","fixed_in":["4.4.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"dhcp","fixed_in":["4.4.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"dhcp","fixed_in":["4.4.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Azure 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Advisory","fix"]},{"url":"https://security.gentoo.org/glsa/202305-22","tags":["vendor-advisory","x_transferred","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25217","tags":["web","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5QI4DYC7J4BGHEW3NH4XHMWTHYC36UK4/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Z2LB42JWIV4M4WDNXX5VGIP26FEYWKIF/"},{"url":"https://github.com/advisories/GHSA-pf98-cx5w-r49r"},{"url":"https://security.alpinelinux.org/vuln/CVE-2021-25217","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/els6/CLSA-2021-1623075541.html","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/ol6/CLSA-2021-1634922551.html","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/ubuntu16_04/CLSA-2021-1635459208","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-25217","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2021-0307.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=28976","tags":["report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/Z2LB42JWIV4M4WDNXX5VGIP26FEYWKIF/","tags":["web"]},{"url":"https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1226","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2357","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#important","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1963258","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2357.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-25217","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-25217","tags":["advisory","report"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2359","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2359.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2405","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2405.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2414","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2414.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2415","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2415.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2416","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2416.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2418","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2418.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2419","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2419.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2420","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2420.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2469","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2469.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2519","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1929858","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1948377","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1957238","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1962650","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2519.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2020-24489","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-24489","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-24489","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-27219","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-27219","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27219","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2555","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1961710","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1976688","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2555.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-3560","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3560","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3560","tags":["advisory"]},{"url":"https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bug/","tags":["article"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","tags":["article"]},{"url":"https://errata.rockylinux.org/RLSA-2021:2359","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-202114740-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1186382","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2021-25217","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-20211822-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-20211841-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-25217","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4969-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-4969-2","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/5DK63QGFHTXASYR656326B4ARJWN2LQV/","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/THX5XKYZAL23HUQMVLFS3L572S4DHQUX/","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2017-3144","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-5732","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-5733","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-6470","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2021-25217","title":"A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient","description":"In ISC DHCP 4.1-ESV-R1 -\u003e 4.1-ESV-R16, ISC DHCP 4.4.0 -\u003e 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.","status":"published","published":"2021-05-26T22:10:11.312Z","modified":"2024-09-16T22:08:32.175Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:32:59.802172Z"}],"euvd":[{"id":"EUVD-2021-12128","description":"In ISC DHCP 4.1-ESV-R1 -\u003e 4.1-ESV-R16, ISC DHCP 4.4.0 -\u003e 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.","status":"published","published":"2021-05-26T22:10:11Z","modified":"2024-09-16T22:08:32Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:55:05.688542Z"}],"ghsa":[{"id":"GHSA-pf98-cx5w-r49r","title":"In ISC DHCP 4.1-ESV-R1 -\u003e 4.1-ESV-R16, ISC DHCP 4.4.0 -\u003e 4.4.2 (Other branches of ISC DHCP (i.e.,...","description":"In ISC DHCP 4.1-ESV-R1 -\u003e 4.1-ESV-R16, ISC DHCP 4.4.0 -\u003e 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.","status":"published","published":"2022-05-24T19:03:33Z","modified":"2023-05-12T05:00:26Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:54:35.04449Z"}],"nvd":[{"id":"CVE-2021-25217","description":"In ISC DHCP 4.1-ESV-R1 -\u003e 4.1-ESV-R16, ISC DHCP 4.4.0 -\u003e 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.","status":"published","published":"2021-05-26T22:15:07.947Z","modified":"2026-06-17T03:41:39.657Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":3.3,"vector":"AV:A/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:06:53.987491Z"}],"osv":[{"id":"ALPINE-CVE-2021-25217","description":"In ISC DHCP 4.1-ESV-R1 -\u003e 4.1-ESV-R16, ISC DHCP 4.4.0 -\u003e 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.","status":"published","published":"2021-05-26T22:15:07.947Z","modified":"2026-10-23T17:17:56.160883973Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:48.646074Z"},{"id":"AZL-6372","title":"CVE-2021-25217 affecting package dhcp for versions less than 4.4.2-4","description":"In ISC DHCP 4.1-ESV-R1 -\u003e 4.1-ESV-R16, ISC DHCP 4.4.0 -\u003e 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.","status":"published","published":"2021-05-26T22:15:07Z","modified":"2026-04-21T04:32:12.523009Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:07.805289Z"},{"id":"CVE-2021-25217","description":"In ISC DHCP 4.1-ESV-R1 -\u003e 4.1-ESV-R16, ISC DHCP 4.4.0 -\u003e 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.","status":"published","published":"2021-05-26T22:15:07.947Z","modified":"2026-10-24T10:31:04.758521039Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:18.778776Z"},{"id":"DEBIAN-CVE-2021-25217","description":"In ISC DHCP 4.1-ESV-R1 -\u003e 4.1-ESV-R16, ISC DHCP 4.4.0 -\u003e 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.","status":"published","published":"2021-05-26T22:15:07.947Z","modified":"2026-10-23T18:02:52.021561419Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:34.637046Z"},{"id":"OESA-2021-1226","title":"dhcp security update","description":"The Dynamic Host Configuration Protocol (DHCP) is a network management protocol used on UDP/IP networks whereby a DHCP server dynamically assigns an IP address and other network configuration parameters to each device on a network so they can communicate with other IP networks.\r\n\r\nSecurity Fix(es):\r\n\r\nIn ISC DHCP 4.1-ESV-R1 -\u0026gt; 4.1-ESV-R16, ISC DHCP 4.4.0 -\u0026gt; 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.(CVE-2021-25217)","status":"published","published":"2021-06-22T11:04:28Z","modified":"2026-08-18T01:15:12.356318013Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:38.987987Z"},{"id":"RHSA-2021:2357","title":"Red Hat Security Advisory: dhcp security update","status":"published","published":"2024-09-13T20:27:38Z","modified":"2026-08-07T10:02:53Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:2359","title":"Red Hat Security Advisory: dhcp security update","status":"published","published":"2024-09-13T20:27:29Z","modified":"2026-08-07T10:02:54Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:2405","title":"Red Hat Security Advisory: dhcp security update","status":"published","published":"2024-09-13T20:27:11Z","modified":"2026-08-07T10:02:55Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:2414","title":"Red Hat Security Advisory: dhcp security update","status":"published","published":"2024-09-13T20:27:46Z","modified":"2026-08-07T10:02:55Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:2415","title":"Red Hat Security Advisory: dhcp security update","status":"published","published":"2024-09-13T20:27:25Z","modified":"2026-08-07T10:02:56Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:2416","title":"Red Hat Security Advisory: dhcp security update","status":"published","published":"2024-09-13T20:27:32Z","modified":"2026-08-07T10:02:57Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:2418","title":"Red Hat Security Advisory: dhcp security update","status":"published","published":"2024-09-13T20:27:18Z","modified":"2026-08-07T10:02:57Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:2419","title":"Red Hat Security Advisory: dhcp security update","status":"published","published":"2024-09-13T20:27:53Z","modified":"2026-08-07T10:02:58Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:2420","title":"Red Hat Security Advisory: dhcp security update","status":"published","published":"2024-09-13T20:27:40Z","modified":"2026-08-07T10:02:58Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:2469","title":"Red Hat Security Advisory: dhcp security update","status":"published","published":"2024-09-13T20:27:16Z","modified":"2026-08-07T10:02:59Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:2519","title":"Red Hat Security Advisory: RHV-H security update (redhat-virtualization-host) 4.3.16","status":"published","published":"2024-09-13T20:27:29Z","modified":"2026-10-15T10:01:58Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:2555","title":"Red Hat Security Advisory: OpenShift Container Platform 4.7.19 packages and security update","status":"published","published":"2024-09-16T05:59:50Z","modified":"2026-08-07T10:03:02Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RLSA-2021:2359","title":"Important: dhcp security update","description":"The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network.\n\nSecurity Fix(es):\n\n* dhcp: stack-based buffer overflow when parsing statements with colon-separated hex digits in config or lease files in dhcpd and dhclient (CVE-2021-25217)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2021-06-09T09:19:12Z","modified":"2026-02-04T07:40:26.624458Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:23.969672Z"},{"id":"UBUNTU-CVE-2021-25217","description":"In ISC DHCP 4.1-ESV-R1 -\u003e 4.1-ESV-R16, ISC DHCP 4.4.0 -\u003e 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.","status":"published","published":"2021-05-26T00:00:00Z","modified":"2026-04-22T12:48:50.178933Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"},{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:26.779273Z"},{"id":"CLSA-2021-1623075541","title":"Fix of CVE: CVE-2021-25217","description":"- CVE-2021-25217: avoid buffer overrun","status":"published","published":"2021-06-07T14:19:01Z","modified":"2026-06-01T00:33:15.007920016Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"id":"CLSA-2021-1634922551","title":"Fixed CVE-2021-25217 in dhcp","description":"- CVE-2021-25217: avoid buffer overrun","status":"published","published":"2021-10-22T17:09:11Z","modified":"2026-06-01T00:33:24.086948076Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"id":"CLSA-2021-1635459208","title":"Fix CVE(s): CVE-2021-25217","description":"\n   * SECURITY UPDATE: buffer overrun in common code (parse_X)\n     - debian/patches/CVE-2021-25217.patch: fix incorrect order of operations in common/parse.c.\n     - CVE-2021-25217","status":"published","published":"2021-10-28T22:13:28Z","modified":"2026-06-04T10:04:15.683477Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"id":"DLA-2674-1","title":"isc-dhcp - security update","status":"published","published":"2021-06-03T00:00:00Z","modified":"2026-03-09T01:23:38.605011Z","updated_at":"2026-11-02T15:46:10.712745Z"},{"id":"MGASA-2021-0307","title":"Updated dhcp packages fix a security vulnerability","description":"A flaw was found in the Dynamic Host Configuration Protocol (DHCP). There is a\ndiscrepancy between the code that handles encapsulated option information \ninleases transmitted \"on the wire\" and the code which reads and parses lease\ninformation after it has been written to disk storage. This flaw allows an\nattacker to deliberately cause a situation where dhcpd while running in DHCPv4\nor DHCPv6 mode, or the dhclient attempts to read a stored lease that contains\noption information, to trigger a stack-based buffer overflow in the option\nparsing code for colon-separated hex digits values. The highest threat from\nthis vulnerability is to data confidentiality and integrity as well as service\navailability (CVE-2021-25217).\n","status":"published","published":"2021-06-30T23:58:41Z","modified":"2026-04-16T04:41:25.474010112Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"openSUSE-SU-2021:0834-1","title":"Security update for dhcp","description":"This update for dhcp fixes the following issues:\n\n- CVE-2021-25217: A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient (bsc#1186382)\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2021-06-03T17:33:35Z","modified":"2026-02-04T02:40:37.038744Z","updated_at":"2026-11-02T16:58:31.879684Z"},{"id":"openSUSE-SU-2021:1841-1","title":"Security update for dhcp","description":"This update for dhcp fixes the following issues:\n\n- CVE-2021-25217: A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient (bsc#1186382)\n","status":"published","published":"2021-07-11T06:25:45Z","modified":"2026-02-04T04:18:51.284892Z","updated_at":"2026-11-02T16:58:32.266854Z"},{"id":"openSUSE-SU-2024:10715-1","title":"dhcp-4.4.2.P1-2.4 on GA media","description":"These are all security issues fixed in the dhcp-4.4.2.P1-2.4 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T04:03:03.793159Z","updated_at":"2026-11-02T16:58:34.487567Z"},{"id":"SUSE-SU-2021:14740-1","title":"Security update for dhcp","description":"This update for dhcp fixes the following issues:\n\n- CVE-2021-25217: A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient (bsc#1186382)\n","status":"published","published":"2021-06-01T12:11:22Z","modified":"2026-02-04T04:12:02.006668Z","updated_at":"2026-11-02T15:53:49.138643Z"},{"id":"SUSE-SU-2021:1822-1","title":"Security update for dhcp","description":"This update for dhcp fixes the following issues:\n\n- CVE-2021-25217: A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient (bsc#1186382)\n","status":"published","published":"2021-06-01T12:12:56Z","modified":"2025-05-02T04:31:14.00971Z","updated_at":"2026-11-02T15:53:49.138643Z"},{"id":"SUSE-SU-2021:1841-1","title":"Security update for dhcp","description":"This update for dhcp fixes the following issues:\n\n- CVE-2021-25217: A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient (bsc#1186382)\n","status":"published","published":"2021-06-02T14:31:23Z","modified":"2026-02-04T04:32:57.295463Z","updated_at":"2026-11-02T15:53:49.138643Z"},{"id":"USN-4969-1","title":"isc-dhcp vulnerability","description":"Jon Franklin and Pawel Wieczorkiewicz discovered that DHCP incorrectly\nhandled lease file parsing. A remote attacker could possibly use this issue\nto cause DHCP to crash, resulting in a denial of service.\n","status":"published","published":"2021-05-27T10:41:47Z","modified":"2026-04-22T10:15:26.001305Z","updated_at":"2026-11-02T16:58:15.159055Z"},{"id":"USN-4969-2","title":"isc-dhcp vulnerability","description":"USN-4969-1 fixed a vulnerability in DHCP. This update provides\nthe corresponding update for Ubuntu 14.04 ESM and 16.04 ESM.\n\n\nOriginal advisory details:\n\n Jon Franklin and Pawel Wieczorkiewicz discovered that DHCP incorrectly\n handled lease file parsing. A remote attacker could possibly use this issue\n to cause DHCP to crash, resulting in a denial of service.\n","status":"published","published":"2021-05-27T12:07:22Z","modified":"2026-06-29T13:49:02.254505155Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}