{"id":"CVE-2022-2663","title":"An issue was found in the Linux kernel in nf_conntrack_irc where the message handling can be confused and incorrectly matches the message","summary":"An issue was found in the Linux kernel in nf_conntrack_irc where the message handling can be confused and incorrectly matches the message. A firewall may be able to be bypassed when users are using unencrypted IRC with nf_conntrack_irc c…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","cwe":["CWE-923"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel","debian_linux = 10.0","debian_linux = 11.0"],"published":"2022-09-01","updated":"2026-10-14","sourceUpdated":"2026-10-14T14:17:22.007","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2022-2663","references":[{"url":"https://dgl.cx/2022/08/nat-again-irc-cve-2022-2663","label":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html","label":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html","label":"secalert@redhat.com"},{"url":"https://lore.kernel.org/netfilter-devel/20220826045658.100360-1-dgl%40dgl.cx/T/","label":"secalert@redhat.com"},{"url":"https://www.debian.org/security/2022/dsa-5257","label":"secalert@redhat.com"},{"url":"https://www.openwall.com/lists/oss-security/2022/08/30/1","label":"secalert@redhat.com"},{"url":"https://www.youtube.com/watch?v=WIq-YgQuYCA","label":"secalert@redhat.com"},{"url":"https://dgl.cx/2022/08/nat-again-irc-cve-2022-2663","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lore.kernel.org/netfilter-devel/20220826045658.100360-1-dgl%40dgl.cx/T/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2022/dsa-5257","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.openwall.com/lists/oss-security/2022/08/30/1","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.youtube.com/watch?v=WIq-YgQuYCA","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-769027.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-794697.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.03194,"epssPercentile":0.87799,"ingestedAt":"2026-10-14T15:36:13.918Z","slug":"CVE-2022-2663","body":"## Overview\n\nAn issue was found in the Linux kernel in nf_conntrack_irc where the message handling can be confused and incorrectly matches the message. A firewall may be able to be bypassed when users are using unencrypted IRC with nf_conntrack_irc configured.\n\n## Affected\n\n- `linux_kernel`\n- `debian_linux = 10.0`\n- `debian_linux = 11.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.2,"likelihood":0.6,"exploitation":0,"ransomware":0},"changes":[]}