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CVE-2012-5839

Heap-based buffer overflow in the gfxShapedWord::CompressedGlyph::IsClusterStart function in...

9.3 HighFix available

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.

Exploit likelihood

7.00%Down 2.9 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 9.3

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.

Record
CVE-2012-5839
CVSS 2.0
9.3 HighAV:N/AC:M/Au:N/C:C/I:C/A:C
Weakness
CWE-787
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2012-5839
Updated
2026-11-02
EUVDEUVD-2012-5717 No score

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.

Record
EUVD-2012-5717
Updated
2026-11-03
GitHub AdvisoriesGHSA-f9x4-662x-q5m7 No score

Heap-based buffer overflow in the gfxShapedWord::CompressedGlyph::IsClusterStart function in...

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.

Record
GHSA-f9x4-662x-q5m7
Weakness
CWE-787
Updated
2026-11-02
OSVopenSUSE-SU-2024:10071-1 No score

MozillaFirefox-50.1.0-1.1 on GA media

These are all security issues fixed in the MozillaFirefox-50.1.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10071-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:10218-1 No score

seamonkey-2.40-6.1 on GA media

These are all security issues fixed in the seamonkey-2.40-6.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10218-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:10230-1 No score

MozillaThunderbird-45.5.1-1.1 on GA media

These are all security issues fixed in the MozillaThunderbird-45.5.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10230-1
Updated
2026-11-02

Affected products

Show 1 moreShow less

Affected packages

Affected packages
PackageAffectedFixed
firefox
Red Hat:enterprise_linux:5::client
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
firefox-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
xulrunner
Red Hat:enterprise_linux:5::client
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
xulrunner-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
xulrunner
Red Hat:enterprise_linux:5::client_workstation
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
xulrunner-debuginfo
Red Hat:enterprise_linux:5::client_workstation
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
xulrunner-devel
Red Hat:enterprise_linux:5::client_workstation
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
firefox
Red Hat:enterprise_linux:5::server
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
firefox-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
xulrunner
Red Hat:enterprise_linux:5::server
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
Show 34 moreShow less
Affected packages
PackageAffectedFixed
xulrunner-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
xulrunner-devel
Red Hat:enterprise_linux:5::server
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
firefox
Red Hat:enterprise_linux:6::client
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
firefox-debuginfo
Red Hat:enterprise_linux:6::client
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
xulrunner
Red Hat:enterprise_linux:6::client
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
xulrunner-debuginfo
Red Hat:enterprise_linux:6::client
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
xulrunner-devel
Red Hat:enterprise_linux:6::client
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
firefox
Red Hat:enterprise_linux:6::computenode
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
firefox-debuginfo
Red Hat:enterprise_linux:6::computenode
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
xulrunner
Red Hat:enterprise_linux:6::computenode
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
xulrunner-debuginfo
Red Hat:enterprise_linux:6::computenode
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
xulrunner-devel
Red Hat:enterprise_linux:6::computenode
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
firefox
Red Hat:enterprise_linux:6::server
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
firefox-debuginfo
Red Hat:enterprise_linux:6::server
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
xulrunner
Red Hat:enterprise_linux:6::server
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
xulrunner-debuginfo
Red Hat:enterprise_linux:6::server
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
xulrunner-devel
Red Hat:enterprise_linux:6::server
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
firefox
Red Hat:enterprise_linux:6::workstation
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
firefox-debuginfo
Red Hat:enterprise_linux:6::workstation
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
xulrunner
Red Hat:enterprise_linux:6::workstation
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
xulrunner-debuginfo
Red Hat:enterprise_linux:6::workstation
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
xulrunner-devel
Red Hat:enterprise_linux:6::workstation
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
thunderbird
Red Hat:enterprise_linux:5::client
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
thunderbird-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
thunderbird
Red Hat:rhel_productivity:5
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
thunderbird-debuginfo
Red Hat:rhel_productivity:5
 before 0:10.0.11-1.el5_8
0:10.0.11-1.el5_8
thunderbird
Red Hat:enterprise_linux:6::client
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
thunderbird-debuginfo
Red Hat:enterprise_linux:6::client
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
thunderbird
Red Hat:enterprise_linux:6::server
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
thunderbird-debuginfo
Red Hat:enterprise_linux:6::server
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
thunderbird
Red Hat:enterprise_linux:6::workstation
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
thunderbird-debuginfo
Red Hat:enterprise_linux:6::workstation
 before 0:10.0.11-1.el6_3
0:10.0.11-1.el6_3
MozillaFirefox
openSUSE:Tumbleweed
 before 50.1.0-1.1
50.1.0-1.1
MozillaThunderbird
openSUSE:Tumbleweed
 before 45.5.1-1.1
45.5.1-1.1

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2012-5839 is a high vulnerability (CVSS 9.3) in Mozilla Firefox, published November 21, 2012. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 7.00%, the 94th percentile. Fixed in firefox 0:10.0.11-1.el5_8.

References

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Left out here: 842 references. The JSON record has them.

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