Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2022-2663

CVE-2022-2663MEDIUM

n/a Linux kernel — An issue was found in the Linux kernel in nf_conntrack_irc where the message handling can be confused and incorrectly matches the message.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  L  N    5.3   .0381   89.9     —

AFFECTED
  Product       Versions   Fixed
  Linux kernel  unknown –  —

TIMELINE
  Aug 4   Reserved by redhat
  Sep 1   Published (CNA: redhat)
  Oct 14  ENRICHED — CVE-2022-2663 (Linux kernel). Received CVSS 5.3 and CPE data from NVD.
  Oct 14  EXPLOIT PUBLISHED — CVE-2022-2663 (Linux kernel). Public exploit reference added.

CWE-923 · CNA: redhat · CVSS v3.1 · 9 references · NVD status: Modified

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
August 4, 2022	Reserved	Reserved by redhat
September 1, 2022	Published	Published (CNA: redhat)
October 14, 2026	ENRICHED	ENRICHED — CVE-2022-2663 (Linux kernel). Received CVSS 5.3 and CPE data from NVD.
October 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2022-2663 (Linux kernel). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	Linux kernel	—	unknown	—

Weaknesses

CWE-923

References (9)

https://cert-portal.siemens.com/productcert/html/ssa-769027.html
https://cert-portal.siemens.com/productcert/html/ssa-794697.html
https://dgl.cx/2022/08/nat-again-irc-cve-2022-2663 [Exploit, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html [Mailing List, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html [Mailing List, Third Party Advisory]
https://lore.kernel.org/netfilter-devel/20220826045658.100360-1-dgl%40dgl.cx/T/
https://www.debian.org/security/2022/dsa-5257 [Third Party Advisory]
https://www.openwall.com/lists/oss-security/2022/08/30/1 [Mailing List, Third Party Advisory]
https://www.youtube.com/watch?v=WIq-YgQuYCA [Exploit, Third Party Advisory]

Authoritative record: CVE-2022-2663 at cve.org

Weaknesses: CWE-923

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2022-2663 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.