CVE-2022-2663

Name: CVE-2022-2663
Creator: NVD / NIST
Published: 2022-09-01T21:15:09.653+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.36%

Last modified Jun 17, 2026

CVE-2022-2663 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 1.36% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

1.36%

68.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-923

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	All versions
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0

References

https://dgl.cx/2022/08/nat-again-irc-cve-2022-2663Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00000.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00001.htmlMailing List, Third Party Advisory
https://lore.kernel.org/netfilter-devel/20220826045658.100360-1-dgl%40dgl.cx/T/
https://www.debian.org/security/2022/dsa-5257Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/08/30/1Mailing List, Third Party Advisory
https://www.youtube.com/watch?v=WIq-YgQuYCAExploit, Third Party Advisory
https://dgl.cx/2022/08/nat-again-irc-cve-2022-2663Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00000.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00001.htmlMailing List, Third Party Advisory
https://lore.kernel.org/netfilter-devel/20220826045658.100360-1-dgl%40dgl.cx/T/
https://www.debian.org/security/2022/dsa-5257Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/08/30/1Mailing List, Third Party Advisory
https://www.youtube.com/watch?v=WIq-YgQuYCAExploit, Third Party Advisory

Timeline

Published: Sep 1, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-2663?

How severe is CVE-2022-2663?

CVE-2022-2663 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.36% probability of exploitation in the next 30 days.

How do I fix CVE-2022-2663?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-2663?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST