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CVE-2012-3978

24
FAUCET Score

CVE-2012-3978 describes a vulnerability in the nsLocation::CheckURL function of Mozilla Firefox, Thunderbird, and SeaMonkey versions prior to 15.0/10.0.7. This flaw allows remote attackers to bypass content-loading restrictions due to an improper security model implementation. With a CVSS score of 6.8, it is considered a medium-severity vulnerability, indicating a network-based attack with medium complexity that could lead to partial confidentiality, integrity, and availability impacts. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
10.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:10.0:*:*:*:*:*:*:*
10.0.1CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:10.0.1:*:*:*:*:*:*:*
10.0.2CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:10.0.2:*:*:*:*:*:*:*
10.0.3CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:10.0.3:*:*:*:*:*:*:*
10.0.4CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:10.0.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.8MEDIUM

AV:N/AC:M/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.30%
Probability of exploitation in next 30 days
EPSS Percentile
81.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0230 is in the 70th percentile among its peer group of 19,955 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

Patch Available

Vendor Patches (7)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: thunderbird-0:10.0.7-1.el5_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:10.0.7-1.el5_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xulrunner-0:10.0.7-2.el5_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: thunderbird-0:10.0.7-1.el6_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:10.0.7-1.el6_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: xulrunner-0:10.0.7-1.el6_3
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2012-3978Moderate

Mozilla: Location object security checks bypassed by chrome code (MFSA 2012-70)

Aug 28, 2012

References

lists.opensuse.org / opensuse-security-announce/2012-08/msg00028.html
lists.opensuse.org / opensuse-security-announce/2012-09/msg00011.html
lists.opensuse.org / opensuse-security-announce/2012-09/msg00014.html
rhn.redhat.com / errata/RHSA-2012-1210.html
rhn.redhat.com / errata/RHSA-2012-1211.html
bugzilla.mozilla.org / show_bug.cgi
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16923
debian.org / security/2012/dsa-2553
debian.org / security/2012/dsa-2554
debian.org / security/2012/dsa-2556
mozilla.org / security/announce/2012/mfsa2012-70.html
Vendor Advisory
securityfocus.com / bid/55306
ubuntu.com / usn/USN-1548-1
ubuntu.com / usn/USN-1548-2
xerox.com / download/security/security-bulletin/16287-4d6b7b0c81f7b/cert_XRX13-003_v1.0.pdf