{"id":"CVE-2018-5732","aliases":["ALPINE-CVE-2018-5732","DEBIAN-CVE-2018-5732","DLA-1313-1","DSA-4133-1","EUVD-2018-17501","GHSA-j4cm-vph7-f7qg","MGASA-2018-0410","RHSA-2018:0469","RHSA-2018:0483","SUSE-SU-2018:0810-1","SUSE-SU-2018:0810-2","SUSE-SU-2018:0812-1","UBUNTU-CVE-2018-5732","USN-3586-1","openSUSE-SU-2024:10715-1"],"status":"published","title":"A specially constructed response from a malicious server can cause a buffer overflow in dhclient","description":"Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -\u003e 4.1-ESV-R15, 4.2.0 -\u003e 4.2.8, 4.3.0 -\u003e 4.3.6, 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Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-5732","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-j4cm-vph7-f7qg"},{"url":"https://security.alpinelinux.org/vuln/CVE-2018-5732","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2018-5732","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2018-0410.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=22674","tags":["report"]},{"url":"https://kb.isc.org/article/AA-01565","tags":["web","article"]},{"url":"https://kb.isc.org/article/AA-01567","tags":["web","article"]},{"url":"https://access.redhat.com/errata/RHSA-2018:0483","tags":["web","advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2018:0469","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#important","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1549960","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1549961","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2018/rhsa-2018_0469.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2018-5732","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-5732","tags":["advisory","report"]},{"url":"https://access.redhat.com/security/cve/CVE-2018-5733","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-5733","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-5733","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2018/rhsa-2018_0483.json","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2018/suse-su-20180810-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1083302","tags":["report"]},{"url":"https://bugzilla.suse.com/1083303","tags":["report"]},{"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/support/update/announcement/2018/suse-su-20180810-2/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2018/suse-su-20180812-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2018-5732","tags":["report"]},{"url":"https://kb.isc.org/article/AA-01565/75/CVE-2018-5732","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-3586-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-3586-2","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2016-2774","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2017-3144","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2018-5733","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2017-3144","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-6470","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-25217","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2018-5732","title":"A specially constructed response from a malicious server can cause a buffer overflow in dhclient","description":"Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -\u003e 4.1-ESV-R15, 4.2.0 -\u003e 4.2.8, 4.3.0 -\u003e 4.3.6, 4.4.0","status":"published","published":"2019-10-09T14:17:14.251Z","modified":"2024-09-16T18:19:36.136Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:35:00.948726Z"}],"euvd":[{"id":"EUVD-2018-17501","description":"Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -\u003e 4.1-ESV-R15, 4.2.0 -\u003e 4.2.8, 4.3.0 -\u003e 4.3.6, 4.4.0","status":"published","published":"2019-10-09T14:17:14Z","modified":"2024-09-16T18:19:36Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:55:33.363823Z"}],"ghsa":[{"id":"GHSA-j4cm-vph7-f7qg","title":"Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious...","description":"Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -\u003e 4.1-ESV-R15, 4.2.0 -\u003e 4.2.8, 4.3.0 -\u003e 4.3.6, 4.4.0","status":"published","published":"2022-05-24T16:58:10Z","modified":"2023-01-28T05:07:02Z","updated_at":"2026-11-02T14:44:29.269512Z"}],"nvd":[{"id":"CVE-2018-5732","description":"Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -\u003e 4.1-ESV-R15, 4.2.0 -\u003e 4.2.8, 4.3.0 -\u003e 4.3.6, 4.4.0","status":"published","published":"2019-10-09T16:15:13.407Z","modified":"2026-06-17T02:00:40.577Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:04:59.278647Z"}],"osv":[{"id":"ALPINE-CVE-2018-5732","description":"Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -\u003e 4.1-ESV-R15, 4.2.0 -\u003e 4.2.8, 4.3.0 -\u003e 4.3.6, 4.4.0","status":"published","published":"2019-10-09T16:15:13.407Z","modified":"2026-10-23T17:17:55.275147763Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:47.663013Z"},{"id":"CVE-2018-5732","description":"Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -\u003e 4.1-ESV-R15, 4.2.0 -\u003e 4.2.8, 4.3.0 -\u003e 4.3.6, 4.4.0","status":"published","published":"2019-10-09T16:15:13.407Z","modified":"2026-10-24T10:31:05.839581086Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:09.442568Z"},{"id":"DEBIAN-CVE-2018-5732","description":"Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -\u003e 4.1-ESV-R15, 4.2.0 -\u003e 4.2.8, 4.3.0 -\u003e 4.3.6, 4.4.0","status":"published","published":"2019-10-09T16:15:13.407Z","modified":"2026-10-23T18:02:29.422261655Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:30.867575Z"},{"id":"RHSA-2018:0469","title":"Red Hat Security Advisory: dhcp security update","status":"published","published":"2024-09-16T01:01:40Z","modified":"2026-07-01T10:03:28Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:04.822845Z"},{"id":"RHSA-2018:0483","title":"Red Hat Security Advisory: dhcp security update","status":"published","published":"2024-09-16T01:01:34Z","modified":"2026-07-01T10:03:31Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:04.822845Z"},{"id":"UBUNTU-CVE-2018-5732","description":"Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -\u003e 4.1-ESV-R15, 4.2.0 -\u003e 4.2.8, 4.3.0 -\u003e 4.3.6, 4.4.0","status":"published","published":"2018-03-01T00:00:00Z","modified":"2026-04-22T11:59:11.297557Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"},{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:18.33562Z"},{"id":"DLA-1313-1","title":"isc-dhcp - security update","status":"published","published":"2018-03-22T00:00:00Z","modified":"2026-03-09T01:02:00.961676Z","updated_at":"2026-11-02T15:46:09.336894Z"},{"id":"DSA-4133-1","title":"isc-dhcp - security update","status":"published","published":"2018-03-07T00:00:00Z","modified":"2026-03-09T01:18:30.986532Z","updated_at":"2026-11-02T15:46:16.862196Z"},{"id":"MGASA-2018-0410","title":"Updated dhcp packages fix security vulnerability","description":"Buffer overflow in dhclient possibly allowing code execution triggered by\nmalicious server (CVE-2018-5732).\n\nReference count overflow in dhcpd allows denial of service\n(CVE-2018-5733).\n","status":"published","published":"2018-10-26T18:47:14Z","modified":"2026-04-16T06:25:29.305219233Z","updated_at":"2026-11-02T15:49:40.793816Z"},{"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-2018:0810-1","title":"Security update for dhcp","description":"This update for dhcp fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2018-5733: reference count overflow in dhcpd (bsc#1083303).\n- CVE-2018-5732: buffer overflow in dhclient (bsc#1083302).\n","status":"published","published":"2018-03-26T09:46:59Z","modified":"2026-02-04T02:56:04.243521Z","updated_at":"2026-11-02T15:53:44.594517Z"},{"id":"SUSE-SU-2018:0810-2","title":"Security update for dhcp","description":"This update for dhcp fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2018-5733: reference count overflow in dhcpd (bsc#1083303).\n- CVE-2018-5732: buffer overflow in dhclient (bsc#1083302).\n","status":"published","published":"2018-03-26T09:46:53Z","modified":"2026-02-04T02:27:09.522034Z","updated_at":"2026-11-02T15:53:44.594517Z"},{"id":"SUSE-SU-2018:0812-1","title":"Security update for dhcp","description":"This update for dhcp fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2018-5733: reference count overflow in dhcpd (bsc#1083303).\n- CVE-2018-5732: buffer overflow in dhclient (bsc#1083302).\n","status":"published","published":"2018-03-26T08:38:57Z","modified":"2026-02-04T02:55:06.329237Z","updated_at":"2026-11-02T15:53:44.594517Z"},{"id":"USN-3586-1","title":"isc-dhcp vulnerabilities","description":"Konstantin Orekhov discovered that the DHCP server incorrectly handled a\nlarge number of concurrent TCP sessions. A remote attacker could possibly\nuse this issue to cause a denial of service. This issue only affected\nUbuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-2774)\n\nIt was discovered that the DHCP server incorrectly handled socket\ndescriptors. A remote attacker could possibly use this issue to cause a\ndenial of service. (CVE-2017-3144)\n\nFelix Wilhelm discovered that the DHCP client incorrectly handled certain\nmalformed responses. A remote attacker could use this issue to cause the\nDHCP client to crash, resulting in a denial of service, or possibly execute\narbitrary code. In the default installation, attackers would be isolated by\nthe dhclient AppArmor profile. (CVE-2018-5732)\n\nFelix Wilhelm discovered that the DHCP server incorrectly handled reference\ncounting. A remote attacker could possibly use this issue to cause the DHCP\nserver to crash, resulting in a denial of service. (CVE-2018-5733)\n","status":"published","published":"2018-03-01T17:47:25Z","modified":"2026-04-22T09:44:28.052641Z","updated_at":"2026-11-02T16:58:13.496563Z"}]}}