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Fencer Intel
high 8.8

CVE-2012-5830 json

Use-after-free vulnerability in Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11, Thunderbird before 17.0, Thunderbird ESR 10.x…

published 2012-11-21 13 y ago modified 2026-06-16 4 mo ago also EUVD-2012-5708

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.8%
EPSS 3.8% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

Use-after-free vulnerability 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 on Mac OS X allows remote attackers to execute arbitrary code via an HTML document.

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

  • 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-2012-5830 updated cvss 6.8

Mozilla: Use-after-free, buffer overflow, and memory corruption issues found using Address Sanitizer (MFSA 2012-106)

  • 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

3.81% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=775228 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

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.