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 configured.
https://www.openwall.com/lists/oss-security/2022/08/30/1
https://www.debian.org/security/2022/dsa-5257
https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html
https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
https://www.cisa.gov/news-events/ics-advisories/icsa-25-044-09
https://www.youtube.com/watch?v=WIq-YgQuYCA
https://lore.kernel.org/netfilter-devel/20220826045658.100360-1-dgl%40dgl.cx/T/
https://dgl.cx/2022/08/nat-again-irc-cve-2022-2663
Source: Mitre, NVD
Published: 2022-09-01
Updated: 2023-02-12
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N
Severity: Medium
Base Score: 5.3
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS: 0.00171