How severe is CVE-2012-2663?

CVE-2012-2663 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2012-2663 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-2663?

CVE-2012-2663 affects Netfilter Iptables. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2012-2663?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2012-2663 published?

CVE-2012-2663 was published on 2014-02-15 and last updated on 2026-06-16.

CVE-2012-2663

CVE-2012-2663 is a high-severity vulnerability in Netfilter Iptables with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Netfilter Iptables
Published: 2014-02-15
Last modified: 2026-06-16

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.

Frequently asked questions

What is 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.
How severe is CVE-2012-2663?: CVE-2012-2663 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2012-2663 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-2663?: CVE-2012-2663 affects Netfilter Iptables. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2012-2663?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2012-2663 published?: CVE-2012-2663 was published on 2014-02-15 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:netfilter:iptables:*:*:*:*:*:*:*:*

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