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CVE-2022-2663

21
FAUCET Score

CVE-2022-2663 describes a vulnerability in the Linux kernel's nf_conntrack_irc module, affecting Debian and other Linux distributions. This flaw allows for firewall bypass when unencrypted IRC is used, due to incorrect message handling. Rated Medium severity (CVSS 5.3), the attack requires no user interaction and has a low impact on integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion, though it did receive limited media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
11.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.43%
Probability of exploitation in next 30 days
EPSS Percentile
70.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0143 is in the 52nd percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-rt-0:4.18.0-477.10.1.rt7.274.el8_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-0:4.18.0-477.10.1.el8_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Extended Update SupportFixed in: kernel-0:4.18.0-372.91.1.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: kernel-0:5.14.0-284.11.1.el9_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: kernel-rt-0:5.14.0-284.11.1.rt14.296.el9_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 8Fixed in: kernel-0:4.18.0-372.91.1.el8_6
View patch

Vendor Advisories (1)

redhatCVE-2022-2663Moderate

kernel: netfilter: nf_conntrack_irc message handling issue

Aug 30, 2022

References

dgl.cx / 2022/08/nat-again-irc-cve-2022-2663
ExploitThird Party Advisory
lists.debian.org / debian-lts-announce/2022/10/msg00000.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2022/11/msg00001.html
Mailing ListThird Party Advisory
lore.kernel.org / netfilter-devel/20220826045658.100360-1-dgl%40dgl.cx/T
debian.org / security/2022/dsa-5257
Third Party Advisory
openwall.com / lists/oss-security/2022/08/30/1
Mailing ListThird Party Advisory
youtube.com / watch
ExploitThird Party Advisory