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CVE-2013-6673

23
FAUCET Score

CVE-2013-6673 describes a vulnerability in Mozilla Firefox, Firefox ESR, Thunderbird, and SeaMonkey where the browsers fail to recognize a user's removal of trust from an EV X.509 certificate. This flaw allows man-in-the-middle attackers to spoof SSL servers under opportunistic circumstances using a valid but user-unacceptable certificate. Rated as MEDIUM severity with a CVSS score of 5.9, the attack vector is network-based with high attack complexity, potentially leading to high integrity impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
18CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:18:*:*:*:*:*:*:*
19CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:19:*:*:*:*:*:*:*
20CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:*
< 26.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
>= 24.0, < 24.2CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.89%
Probability of exploitation in next 30 days
EPSS Percentile
85.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0289 is in the 78th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2013-6673Moderate

Mozilla: Trust settings for built-in roots ignored during EV certificate validation (MFSA 2013-113)

Dec 10, 2013

References

lists.fedoraproject.org / pipermail/package-announce/2013-December/123437.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2013-December/124108.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2013-December/124257.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2014-January/125470.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2013-12/msg00010.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2013-12/msg00085.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2013-12/msg00086.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2013-12/msg00087.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2013-12/msg00119.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2013-12/msg00120.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2013-12/msg00121.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2014-01/msg00002.html
Mailing ListThird Party Advisory
bugzilla.mozilla.org / show_bug.cgi
ExploitIssue TrackingVendor Advisory
security.gentoo.org / glsa/201504-01
Third Party Advisory
mozilla.org / security/announce/2013/mfsa2013-113.html
Vendor Advisory
oracle.com / technetwork/topics/security/bulletinapr2016-2952098.html
Third Party Advisory
securityfocus.com / bid/64213
Third Party AdvisoryVDB Entry
securitytracker.com / id/1029470
Third Party AdvisoryVDB Entry
securitytracker.com / id/1029476
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-2052-1
Third Party Advisory
ubuntu.com / usn/USN-2053-1
Third Party Advisory