CVE-2012-2663

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.

Published: 2014-02-15 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-2663 is rated Moderate Risk (50.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.36%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2012-2663

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-30 0.24% 0.36% +0.12%
2 2026-01-19 0.48% 0.24% -0.24%
3 2025-12-11 — 0.48% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-2663

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2012-2663

OS Trackers for CVE-2012-2663

vendor priority summary link
debian unimportant CVE-2012-2663 unimportant priority: Debian including 1 source packages (iptables), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5. https://security-tracker.debian.org/tracker/CVE-2012-2663
redhat medium — https://access.redhat.com/security/cve/CVE-2012-2663
ubuntu low CVE-2012-2663 low priority: Ubuntu including 1 source packages (iptables), 22 status rows across 22 suites (artful, bionic, cosmic, disco, eoan, focal, hardy, lucid, natty, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): ignored 21, needed 1. https://ubuntu.com/security/CVE-2012-2663

Affected software / configurations for CVE-2012-2663

Vendor Product Version Raw CPE
netfilter iptables <= 1.4.21 cpe:2.3:a:netfilter:iptables:*:*:*:*:*:*:*:*

References for CVE-2012-2663

URL Tags
http://www.spinics.net/lists/netfilter-devel/msg21248.html Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=826702 Issue Tracking Mitigation Patch Third Party Advisory
cvelogic Threat Intelligence