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Fencer Intel
critical 10.0

CVE-2012-1962 json

Use-after-free vulnerability in the JSDependentString::undepend function in Mozilla Firefox 4.x through 13.0, Firefox ESR 10.x before 10.0.…

published 2012-07-18 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-1971

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.6%
EPSS 5.6% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

Use-after-free vulnerability in the JSDependentString::undepend function in Mozilla Firefox 4.x through 13.0, Firefox ESR 10.x before 10.0.6, Thunderbird 5.0 through 13.0, Thunderbird ESR 10.x before 10.0.6, and SeaMonkey before 2.11 allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via vectors involving strings with multiple dependencies.

Patch / fix

  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 10.0.6-1.el5_8
  • thunderbird RHEL 6 10.0.6-1.el6_3
  • firefox RHEL 5 10.0.6-1.el5_8
  • firefox RHEL 6 10.0.6-1.el6_3
  • xulrunner RHEL 5 10.0.6-2.el5_8
  • xulrunner RHEL 6 10.0.6-1.el6_3

red hat advisories RHSA-2012:1089RHSA-2012:1088

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 45.5.1-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1openSUSE-SU-2024:10230-1

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-2012-1962 updated cvss 6.8

Mozilla: JSDependentString:: undepend string conversion results in memory corruption (MFSA 2012-52)

  • Red Hat Enterprise Linux (v. 5 server) firefox 10.0.6-1.el5_8, xulrunner 10.0.6-2.el5_8 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 10.0.6-1.el5_8, xulrunner 10.0.6-2.el5_8, thunderbird 10.0.6-1.el5_8 Red Hat Enterprise Linux Desktop (v. 6) firefox 10.0.6-1.el6_3, xulrunner 10.0.6-1.el6_3, thunderbird 10.0.6-1.el6_3 Red Hat Enterprise Linux Desktop Optional (v. 6) xulrunner 10.0.6-1.el6_3 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 10.0.6-1.el6_3, xulrunner 10.0.6-1.el6_3 Red Hat Enterprise Linux Server (v. 6) firefox 10.0.6-1.el6_3, xulrunner 10.0.6-1.el6_3
    +4 more products
    Red Hat Enterprise Linux Server Optional (v. 6) xulrunner 10.0.6-1.el6_3, thunderbird 10.0.6-1.el6_3 Red Hat Enterprise Linux Workstation (v. 6) firefox 10.0.6-1.el6_3, xulrunner 10.0.6-1.el6_3, thunderbird 10.0.6-1.el6_3 Red Hat Enterprise Linux Workstation Optional (v. 6) xulrunner 10.0.6-1.el6_3 Red Hat RHEL Desktop Workstation (v. 5 client) xulrunner 10.0.6-2.el5_8
    fixed: vendor fix RHSA-2012:1088
  • Red Hat RHEL Optional Productivity Applications (v. 5 server) thunderbird 10.0.6-1.el5_8
    fixed: vendor fix RHSA-2012:1089

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

5.59% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-399 Resource Management Errors

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.