CVE-2012-2663

Name: CVE-2012-2663
Creator: NVD / NIST
Published: 2014-02-15T14:57:07.423+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.85%

Last modified Jun 16, 2026

CVE-2012-2663 is a vulnerability of currently unknown severity. extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn rules, which might allow remote attackers to bypass intended firewall restrictions via crafted packets. NOTE: the CVE-2012-6638 fix makes this issue less relevant.. EPSS estimates a 2.85% chance of exploitation in the next 30 days.

Description

extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn rules, which might allow remote attackers to bypass intended firewall restrictions via crafted packets. NOTE: the CVE-2012-6638 fix makes this issue less relevant.

Metrics

EPSS Probability

2.85%

84.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Netfilter	Iptables	<= 1.4.21

References

http://www.spinics.net/lists/netfilter-devel/msg21248.htmlPatch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=826702Issue Tracking, Mitigation, Patch, Third Party Advisory
http://www.spinics.net/lists/netfilter-devel/msg21248.htmlPatch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=826702Issue Tracking, Mitigation, Patch, Third Party Advisory

Timeline

Published: Feb 15, 2014
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2012-2663?

How severe is CVE-2012-2663?

Severity scoring for CVE-2012-2663 is pending analysis. The EPSS model estimates a 2.85% probability of exploitation in the next 30 days.

How do I fix CVE-2012-2663?

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-2012-2663?

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

Scan your code now

Source: NVD / NIST