Is CVE-2013-6673 being actively exploited?

CVE-2013-6673 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2013-6673?

CVE-2013-6673 has a CVSS 3.1 base score of 5.9 (MEDIUM).

CVE-2013-6673

MEDIUM · CVSS 5.9EPSS 2.9%EU EUVD

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.

Key facts

CVSS score: 5.9 (v3.1)
Severity: MEDIUM
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-310
EPSS score: 2.9% (87th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2013-6475)
Published: December 11, 2013
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2013-6475 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
fedoraproject / fedora
fedoraproject / fedora
fedoraproject / fedora
mozilla / firefox
mozilla / seamonkey
mozilla / thunderbird
opensuse / opensuse
opensuse / opensuse
opensuse / opensuse
suse / linux enterprise desktop
suse / linux enterprise server
suse / linux enterprise server
suse / suse linux enterprise software development kit

Certified products that may be affected

2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

SUSE Linux Enterprise Server 11 Service Pack 2 on IBM System z - SUSE Linux Products Gmbh - Common Criteria BSI-DSZ-CC-0852-2013 - archived
SUSE Linux Enterprise Server 11 Service Pack 2 including KVM virtualization - SUSE Linux Products Gmbh - Common Criteria BSI-DSZ-CC-0787-2013 - archived

References

http://lists.fedoraproject.org/pipermail/package-announce/2013-December/123437.html(Mailing List, Third Party Advisory)
http://lists.fedoraproject.org/pipermail/package-announce/2013-December/124108.html(Mailing List, Third Party Advisory)
http://lists.fedoraproject.org/pipermail/package-announce/2013-December/124257.html(Mailing List, Third Party Advisory)
http://lists.fedoraproject.org/pipermail/package-announce/2014-January/125470.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2013-12/msg00010.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-updates/2013-12/msg00085.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-updates/2013-12/msg00086.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-updates/2013-12/msg00087.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-updates/2013-12/msg00119.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-updates/2013-12/msg00120.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-updates/2013-12/msg00121.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-updates/2014-01/msg00002.html(Mailing List, Third Party Advisory)
http://www.mozilla.org/security/announce/2013/mfsa2013-113.html(Vendor Advisory)
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html(Third Party Advisory)
http://www.securityfocus.com/bid/64213(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1029470(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1029476(Third Party Advisory, VDB Entry)
http://www.ubuntu.com/usn/USN-2052-1(Third Party Advisory)
http://www.ubuntu.com/usn/USN-2053-1(Third Party Advisory)
https://bugzilla.mozilla.org/show_bug.cgi?id=917380(Exploit, Issue Tracking, Vendor Advisory)
https://security.gentoo.org/glsa/201504-01(Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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