What’s Vulnerable › Vulnerabilities

CVE-2013-6673

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2013-12-11 · updated 2026-06-17
• Weakness: CWE-310

Description

Mozilla Firefox before 26.0, Firefox ESR 24.x before 24.2, Thunderbird before 24.2, and SeaMonkey before 2.23 do not recognize a user's removal of trust from an EV X.509 certificate, which makes it easier for man-in-the-middle attackers to spoof SSL servers in opportunistic circumstances via a valid certificate that is unacceptable to the user.

Affected products

• Canonical Ubuntu Linux: 12.04, 12.10, 13.04, 13.10
• Fedoraproject Fedora: 18, 19, 20
• Mozilla Firefox: before 26.0; from 24.0 before 24.2 — fixed in 24.2, 26.0
• Mozilla Seamonkey: before 2.23 — fixed in 2.23
• Mozilla Thunderbird: before 24.2 — fixed in 24.2
• Opensuse: 12.2, 12.3, 13.1
• SUSE Linux Enterprise Server 15 SP1: 11-sp3
• SUSE Linux Enterprise Server: 11-sp3
• Suse Linux Enterprise Software Development Kit: 11.0-sp3

How to fix

Upgrade to a fixed version: Mozilla Firefox 24.2, 26.0; Mozilla Seamonkey 2.23; Mozilla Thunderbird 24.2. Check the vendor advisory for mitigations.

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

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