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Fencer Intel
critical 9.3

CVE-2012-4216 json

Use-after-free vulnerability in the gfxFont::GetFontEntry function in Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11, Thunder…

published 2012-11-21 13 y ago modified 2026-06-16 4 mo ago also EUVD-2012-4160

cvss
9.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.1%
EPSS 6.1% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

Use-after-free vulnerability in the gfxFont::GetFontEntry function in Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11, Thunderbird before 17.0, Thunderbird ESR 10.x before 10.0.11, and SeaMonkey before 2.14 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.

Patch / fix

  • mozilla firefox 10.0.11, 17.0
  • mozilla seamonkey 2.14
  • mozilla thunderbird 17.0
  • mozilla thunderbird_esr 10.0.11
  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 10.0.11-1.el5_8
  • thunderbird RHEL 6 10.0.11-1.el6_3
  • firefox RHEL 5 10.0.11-1.el5_8
  • firefox RHEL 6 10.0.11-1.el6_3
  • xulrunner RHEL 5 10.0.11-1.el5_8
  • xulrunner RHEL 6 10.0.11-1.el6_3

red hat advisories RHSA-2012:1483RHSA-2012:1482

  • 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-2012-4216 updated cvss 6.8

Mozilla: Use-after-free and buffer overflow issues found using Address Sanitizer (MFSA 2012-105)

  • Red Hat Enterprise Linux (v. 5 server) firefox 10.0.11-1.el5_8, xulrunner 10.0.11-1.el5_8 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 10.0.11-1.el5_8, xulrunner 10.0.11-1.el5_8, thunderbird 10.0.11-1.el5_8 Red Hat Enterprise Linux Desktop (v. 6) firefox 10.0.11-1.el6_3, xulrunner 10.0.11-1.el6_3, thunderbird 10.0.11-1.el6_3 Red Hat Enterprise Linux Desktop Optional (v. 6) xulrunner 10.0.11-1.el6_3 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 10.0.11-1.el6_3, xulrunner 10.0.11-1.el6_3 Red Hat Enterprise Linux Server (v. 6) firefox 10.0.11-1.el6_3, xulrunner 10.0.11-1.el6_3
    +4 more products
    Red Hat Enterprise Linux Server Optional (v. 6) xulrunner 10.0.11-1.el6_3, thunderbird 10.0.11-1.el6_3 Red Hat Enterprise Linux Workstation (v. 6) firefox 10.0.11-1.el6_3, xulrunner 10.0.11-1.el6_3, thunderbird 10.0.11-1.el6_3 Red Hat Enterprise Linux Workstation Optional (v. 6) xulrunner 10.0.11-1.el6_3 Red Hat RHEL Desktop Workstation (v. 5 client) xulrunner 10.0.11-1.el5_8
    fixed: vendor fix RHSA-2012:1482
  • Red Hat RHEL Optional Productivity Applications (v. 5 server) thunderbird 10.0.11-1.el5_8
    fixed: vendor fix RHSA-2012:1483

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

6.07% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=798853 referenced PoC, tagged "exploit" by a source, unverified

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

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.