CVE-2013-6671

CVE-2013-6671 is a critical-severity vulnerability in Mozilla Firefox with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 11% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-94.

Key facts

• Severity: Critical (CVSS 3.x base score 9.8)
• CVSS v2: 10.0
• EPSS exploit prediction: 11% (96th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-94
• Affected product: Mozilla Firefox
• Published: 2013-12-11
• Last modified: 2026-06-17

Description

The nsGfxScrollFrameInner::IsLTR function in Mozilla Firefox before 26.0, Firefox ESR 24.x before 24.2, Thunderbird before 24.2, and SeaMonkey before 2.23 allows remote attackers to execute arbitrary code via crafted use of JavaScript code for ordered list elements.

Frequently asked questions

What is CVE-2013-6671?

The nsGfxScrollFrameInner::IsLTR function in Mozilla Firefox before 26.0, Firefox ESR 24.x before 24.2, Thunderbird before 24.2, and SeaMonkey before 2.23 allows remote attackers to execute arbitrary code via crafted use of JavaScript code for ordered list elements.

How severe is CVE-2013-6671?

CVE-2013-6671 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2013-6671 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-6671?

CVE-2013-6671 primarily affects Mozilla Firefox. In total, 27 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-6671?

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

When was CVE-2013-6671 published?

CVE-2013-6671 was published on 2013-12-11 and last updated on 2026-06-17.

References

• http://lists.fedoraproject.org/pipermail/package-announce/2013-December/123437.html
• http://lists.fedoraproject.org/pipermail/package-announce/2013-December/124108.html
• http://lists.fedoraproject.org/pipermail/package-announce/2013-December/124257.html
• http://lists.fedoraproject.org/pipermail/package-announce/2014-January/125470.html
• http://lists.opensuse.org/opensuse-security-announce/2013-12/msg00010.html
• http://lists.opensuse.org/opensuse-updates/2013-12/msg00085.html
• http://lists.opensuse.org/opensuse-updates/2013-12/msg00086.html
• http://lists.opensuse.org/opensuse-updates/2013-12/msg00087.html
• http://lists.opensuse.org/opensuse-updates/2013-12/msg00119.html
• http://lists.opensuse.org/opensuse-updates/2013-12/msg00120.html
• http://lists.opensuse.org/opensuse-updates/2013-12/msg00121.html
• http://lists.opensuse.org/opensuse-updates/2014-01/msg00002.html
• http://rhn.redhat.com/errata/RHSA-2013-1812.html
• http://www.mozilla.org/security/announce/2013/mfsa2013-111.html
• http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
• http://www.securityfocus.com/bid/64212
• http://www.securitytracker.com/id/1029470
• http://www.securitytracker.com/id/1029476
• http://www.ubuntu.com/usn/USN-2052-1
• http://www.ubuntu.com/usn/USN-2053-1
• https://bugzilla.mozilla.org/show_bug.cgi?id=930281
• https://security.gentoo.org/glsa/201504-01

Affected products (27)

• cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:13.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:13.10:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_eus:6.5:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server:5.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_aus:6.5:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_eus:6.5:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_tus:6.5:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_workstation:5.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
• cpe:2.3:a:suse:suse_linux_enterprise_software_development_kit:11.0:sp3:*:*:*:*:*:*
• cpe:2.3:o:opensuse:opensuse:12.2:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:opensuse:12.3:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_desktop:11:sp3:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:11:sp3:*:*:*:vmware:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:11:sp3:*:*:-:*:*:*
• cpe:2.3:o:fedoraproject:fedora:18:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:19:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:*

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