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Fencer Intel
critical 9.3

CVE-2012-4187 json

Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbird before 16.0, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey bef…

published 2012-10-10 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-4131

cvss
9.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.8%
EPSS 6.8% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbird before 16.0, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey before 2.13 do not properly manage a certain insPos variable, which allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption and assertion failure) via unspecified vectors.

Patch / fix

  • mozilla firefox 10.0.8, 16.0
  • mozilla thunderbird_esr 10.0.8
  • mozilla thunderbird 16.0
  • mozilla seamonkey 2.13
  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 10.0.8-1.el5_8
  • thunderbird RHEL 6 10.0.8-1.el6_3
  • firefox RHEL 5 10.0.8-1.el5_8
  • firefox RHEL 6 10.0.8-1.el6_3
  • xulrunner RHEL 5 10.0.8-1.el5_8
  • xulrunner RHEL 6 10.0.8-1.el6_3

red hat advisories RHSA-2012:1351RHSA-2012:1350

  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 45.5.1-1.1

opensuse advisories openSUSE-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-2012-4187 updated cvss 6.8

Mozilla: Heap memory corruption issues found using Address Sanitizer (MFSA 2012-86)

  • Red Hat Enterprise Linux (v. 5 server) firefox 10.0.8-1.el5_8, xulrunner 10.0.8-1.el5_8 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 10.0.8-1.el5_8, xulrunner 10.0.8-1.el5_8, thunderbird 10.0.8-1.el5_8 Red Hat Enterprise Linux Desktop (v. 6) firefox 10.0.8-1.el6_3, xulrunner 10.0.8-1.el6_3, thunderbird 10.0.8-1.el6_3 Red Hat Enterprise Linux Desktop Optional (v. 6) xulrunner 10.0.8-1.el6_3 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 10.0.8-1.el6_3, xulrunner 10.0.8-1.el6_3 Red Hat Enterprise Linux Server (v. 6) firefox 10.0.8-1.el6_3, xulrunner 10.0.8-1.el6_3
    +4 more products
    Red Hat Enterprise Linux Server Optional (v. 6) xulrunner 10.0.8-1.el6_3, thunderbird 10.0.8-1.el6_3 Red Hat Enterprise Linux Workstation (v. 6) firefox 10.0.8-1.el6_3, xulrunner 10.0.8-1.el6_3, thunderbird 10.0.8-1.el6_3 Red Hat Enterprise Linux Workstation Optional (v. 6) xulrunner 10.0.8-1.el6_3 Red Hat RHEL Desktop Workstation (v. 5 client) xulrunner 10.0.8-1.el5_8
    fixed: vendor fix RHSA-2012:1350
  • Red Hat RHEL Optional Productivity Applications (v. 5 server) thunderbird 10.0.8-1.el5_8
    fixed: vendor fix RHSA-2012:1351

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

6.84% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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.