CVE-2012-5839 json
Heap-based buffer overflow in the gfxShapedWord::CompressedGlyph::IsClusterStart function in Mozilla Firefox before 17.0, Firefox ESR 10.x…
published 2012-11-21 13 y ago modified 2026-06-16 4 mo ago also EUVD-2012-5717
- cvss
- 9.3
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 7.0%
- EPSS 7.0% chance of exploitation in 30 days, percentile 94%
- public exploits
- 0
- none known
Summary
Heap-based buffer overflow in the gfxShapedWord::CompressedGlyph::IsClusterStart 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 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-2012-5839 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_3fixed: vendor fix RHSA-2012:1482
+4 more productsfewer
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 -
Red Hat RHEL Optional Productivity Applications (v. 5 server) thunderbird 10.0.11-1.el5_8fixed: 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
7.00% 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-787 Out-of-bounds Write
References
-
bugzilla.mozilla.org
/show_bug.cgi?id=804927
issue-tracking, patch, vendor-advisory
-
ubuntu.com
/usn/USN-1638-3
vendor-advisory, third-party-advisory
-
ubuntu.com
/usn/USN-1638-2
vendor-advisory, third-party-advisory
-
lists.opensuse.org
/opensuse-updates/2012-11/msg00093.html
vendor-advisory, mailing-list, third-party-advisory
-
ubuntu.com
/usn/USN-1636-1
vendor-advisory, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2013-01/msg00022.html
vendor-advisory, mailing-list, third-party-advisory
-
rhn.redhat.com
/errata/RHSA-2012-1483.html
vendor-advisory, third-party-advisory
-
rhn.redhat.com
/errata/RHSA-2012-1482.html
vendor-advisory, third-party-advisory
-
lists.opensuse.org
/opensuse-updates/2012-11/msg00090.html
vendor-advisory, mailing-list, third-party-advisory
-
ubuntu.com
/usn/USN-1638-1
vendor-advisory, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2012-11/msg00021.html
vendor-advisory, mailing-list, third-party-advisory
-
mandriva.com
/security/advisories?name=MDVSA-2012:173
vendor-advisory, third-party-advisory
-
lists.opensuse.org
/opensuse-updates/2012-11/msg00092.html
vendor-advisory, mailing-list, third-party-advisory
-
mozilla.org
/security/announce/2012/mfsa2012-105.html
vendor-advisory
-
oval.cisecurity.org
/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16968
vdb-entry, signature, third-party-advisory
-
secunia.com
/advisories/51370
third-party-advisory
-
exchange.xforce.ibmcloud.com
/vulnerabilities/80196
vdb-entry, third-party-advisory
-
palemoon.org
/releasenotes-ng.shtml
broken-link
-
secunia.com
/advisories/51434
third-party-advisory
-
secunia.com
/advisories/51439
third-party-advisory
-
osvdb.org
/87607
vdb-entry, broken-link
-
secunia.com
/advisories/51440
third-party-advisory
-
secunia.com
/advisories/51359
third-party-advisory
-
secunia.com
/advisories/51381
third-party-advisory
-
secunia.com
/advisories/51369
third-party-advisory
-
secunia.com
/advisories/51360
third-party-advisory
-
securityfocus.com
/bid/56637
vdb-entry, third-party-advisory
Sources
- CVE List CVE-2012-5839
- NVD CVE-2012-5839
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.