{"id":"CVE-2016-2774","aliases":["DEBIAN-CVE-2016-2774","DLA-2003-1","EUVD-2016-3848","GHSA-rg7r-5jqm-6r7j","RHSA-2016:2590","SUSE-SU-2016:1692-1","SUSE-SU-2016:1735-1","SUSE-SU-2016:1791-1","SUSE-SU-2016:2024-1","UBUNTU-CVE-2016-2774","USN-3586-1"],"status":"published","title":"ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number...","description":"ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.73622,"percentile":0.99473,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2016-03-09T00:00:00Z","modified":"2026-10-24T10:30:42Z","fixes":[{"ecosystem":"Debian:12","package":"isc-dhcp","fixed_in":["4.3.4-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"isc-dhcp","fixed_in":["4.3.4-1"],"sources":["osv"]},{"ecosystem":"Debian:8","package":"isc-dhcp","fixed_in":["4.3.1-6+deb8u4"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:7::client","package":"dhcp","fixed_in":["12:4.2.5-47.el7"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:7::client","package":"dhcp-debuginfo","fixed_in":["12:4.2.5-47.el7"],"sources":["osv"]},{"ecosystem":"Red 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Advisory","advisory"]},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183458.html","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","Third Party Advisory","advisory"]},{"url":"http://www.securityfocus.com/bid/84208","tags":["vdb-entry","x_refsource_BID","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2019/11/msg00023.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-2774","tags":["advisory"]},{"url":"https://usn.ubuntu.com/3586-1"},{"url":"https://github.com/advisories/GHSA-rg7r-5jqm-6r7j"},{"url":"https://security-tracker.debian.org/tracker/CVE-2016-2774","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2016:2590","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","tags":["article"]},{"url":"https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.3_Release_Notes/index.html","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1315259","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2016/rhsa-2016_2590.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2016-2774","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-2774","tags":["advisory","report"]},{"url":"https://www.suse.com/support/update/announcement/2016/suse-su-20161692-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/969820","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2774","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2016/suse-su-20161735-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2016/suse-su-20161791-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/972907","tags":["report"]},{"url":"https://www.suse.com/support/update/announcement/2016/suse-su-20162024-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2016-2774","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-3586-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2017-3144","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2018-5732","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2018-5733","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2016-2774","description":"ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.","status":"published","published":"2016-03-09T15:26:00Z","modified":"2024-08-05T23:32:20.98Z","updated_at":"2026-11-02T14:33:33.07583Z"}],"euvd":[{"id":"EUVD-2016-3848","description":"ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.","status":"published","published":"2016-03-09T15:26:00Z","modified":"2024-08-05T23:32:20Z","updated_at":"2026-11-03T02:22:52.753944Z"}],"ghsa":[{"id":"GHSA-rg7r-5jqm-6r7j","title":"ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number...","description":"ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.","status":"published","published":"2022-05-13T01:29:00Z","modified":"2025-04-12T12:58:40Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:01:26.389958Z"}],"nvd":[{"id":"CVE-2016-2774","description":"ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.","status":"published","published":"2016-03-09T15:59:00.147Z","modified":"2026-06-17T00:44:22.367Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":7.1,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:03:22.479119Z"}],"osv":[{"id":"CVE-2016-2774","description":"ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.","status":"published","published":"2016-03-09T15:59:00.147Z","modified":"2026-10-24T10:30:42.421519766Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:02.114472Z"},{"id":"DEBIAN-CVE-2016-2774","description":"ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.","status":"published","published":"2016-03-09T15:59:00.147Z","modified":"2026-09-22T07:01:56.22353669Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:27.627285Z"},{"id":"UBUNTU-CVE-2016-2774","description":"ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.","status":"published","published":"2016-03-09T00:00:00Z","modified":"2026-04-22T10:38:57.23916Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:11.872222Z"},{"id":"DLA-2003-1","title":"isc-dhcp - security update","status":"published","published":"2019-11-24T00:00:00Z","modified":"2026-03-09T01:23:20.802625Z","updated_at":"2026-11-02T15:46:10.227108Z"},{"id":"RHSA-2016:2590","title":"Red Hat Security Advisory: dhcp security, bug fix, and enhancement update","status":"published","published":"2024-09-15T23:23:02Z","modified":"2026-06-26T12:21:52.5858622Z","updated_at":"2026-11-02T15:53:03.734507Z"},{"id":"SUSE-SU-2016:1692-1","title":"Security update for dhcp","description":"\nThis update for dhcp fixes the following issues:\n\n- CVE-2016-2774: Fixed a denial of service attack against the DHCP server over the OMAPI TCP socket, which could be used\n  by network adjacent attackers to make the DHCP server non-functional (bsc#969820).\n","status":"published","published":"2016-06-27T14:32:04Z","modified":"2026-02-04T04:26:43.372563Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"SUSE-SU-2016:1735-1","title":"Security update for dhcp","description":"\nThis update for dhcp fixes the following issues:\n\n- CVE-2016-2774: Fixed a denial of service attack against the DHCP server over the OMAPI TCP socket, which could be used\n  by network adjacent attackers to make the DHCP server non-functional (bsc#969820).\n","status":"published","published":"2016-07-05T11:12:05Z","modified":"2026-02-04T04:01:09.124378Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"SUSE-SU-2016:1791-1","title":"Security update for dhcp","description":"\nThis update for dhcp fixes the following issues:\n\nSecurity issue fixed:\n- CVE-2016-2774: Fixed a denial of service attack against the DHCP server over the OMAPI TCP socket, which could be used\n  by network adjacent attackers to make the DHCP server non-functional (bsc#969820).\n\nNon security issues fixed:\n- Rename freeaddrinfo(), getaddrinfo() and getnameinfo() in the internal libirs\n  library that does not consider /etc/hosts and /etc/nsswitch.conf to use irs_\n  prefix. This prevents name conflicts which would result in overriding standard\n  glibc functions used by libldap. (bsc#972907)\n","status":"published","published":"2016-07-13T10:26:25Z","modified":"2026-02-04T04:09:52.271905Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"SUSE-SU-2016:2024-1","title":"Security update for dhcp","description":"\nThis update for dhcp fixes the following issues:\n\n- CVE-2016-2774: Fixed a denial of service attack against the DHCP server over the OMAPI TCP socket, which could be used\n  by network adjacent attackers to make the DHCP server non-functional (bsc#969820).\n","status":"published","published":"2016-08-10T11:39:02Z","modified":"2026-02-04T03:42:23.674713Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"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"}]}}