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Fencer Intel
medium 4.3

CVE-2012-3976 json

Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, and SeaMonkey before 2.12 do not properly handle onLocationChange events durin…

published 2012-08-29 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-3920

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, and SeaMonkey before 2.12 do not properly handle onLocationChange events during navigation between different https sites, which allows remote attackers to spoof the X.509 certificate information in the address bar via a crafted web page.

Patch / fix

  • mozilla firefox 10.0.7, 15.0
  • mozilla seamonkey 2.12
  • firefox RHEL 5 10.0.7-1.el5_8
  • firefox RHEL 6 10.0.7-1.el6_3
  • xulrunner RHEL 5 10.0.7-2.el5_8
  • xulrunner RHEL 6 10.0.7-1.el6_3

red hat advisories RHSA-2012:1210

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2012-3976 updated cvss 4.3

Mozilla: Incorrect site SSL certificate data display (MFSA 2012-69)

  • Red Hat Enterprise Linux (v. 5 server) firefox 10.0.7-1.el5_8, xulrunner 10.0.7-2.el5_8 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 10.0.7-1.el5_8, xulrunner 10.0.7-2.el5_8 Red Hat Enterprise Linux Desktop (v. 6) firefox 10.0.7-1.el6_3, xulrunner 10.0.7-1.el6_3 Red Hat Enterprise Linux Desktop Optional (v. 6) xulrunner 10.0.7-1.el6_3 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 10.0.7-1.el6_3, xulrunner 10.0.7-1.el6_3 Red Hat Enterprise Linux Server (v. 6) firefox 10.0.7-1.el6_3, xulrunner 10.0.7-1.el6_3
    +4 more products
    Red Hat Enterprise Linux Server Optional (v. 6) xulrunner 10.0.7-1.el6_3 Red Hat Enterprise Linux Workstation (v. 6) firefox 10.0.7-1.el6_3, xulrunner 10.0.7-1.el6_3 Red Hat Enterprise Linux Workstation Optional (v. 6) xulrunner 10.0.7-1.el6_3 Red Hat RHEL Desktop Workstation (v. 5 client) xulrunner 10.0.7-2.el5_8
    fixed: vendor fix RHSA-2012:1210

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.78% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.