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CVE-2012-5839

9.3 · HIGH

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 1…

Published Nov 21, 2012mozillaCWE-787EPSS 7.00%

Overview

CVE-2012-5839 is a high-severity vulnerability affecting mozilla firefox. It was published on November 21, 2012 and has a CVSS 2.0 base score of 9.3 (HIGH).

This vulnerability has a CVSS 2.0 base score of 9.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories and patches from mozilla. Update firefox to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
mozillafirefox>= 0, < 10.0.11Affected
mozillaseamonkey>= 0, < 2.14Affected
mozillathunderbird>= 0, < 17.0Affected
mozillathunderbird_esr>= 0, < 10.0.11Affected

References

Reflists.opensuse.org/opensuse-security-announce/2012-11/msg00021.htmlReflists.opensuse.org/opensuse-security-announce/2013-01/msg00022.htmlReflists.opensuse.org/opensuse-updates/2012-11/msg00090.htmlReflists.opensuse.org/opensuse-updates/2012-11/msg00092.htmlReflists.opensuse.org/opensuse-updates/2012-11/msg00093.htmlRefosvdb.org/87607Refrhn.redhat.com/errata/RHSA-2012-1482.htmlRefrhn.redhat.com/errata/RHSA-2012-1483.htmlRefsecunia.com/advisories/51359Refsecunia.com/advisories/51360

How CyberStrike helps

Frequently asked questions

What is CVE-2012-5839?

CVE-2012-5839 is a high-severity vulnerability affecting mozilla firefox. It was published on November 21, 2012 and has a CVSS 2.0 base score of 9.3 (HIGH).

How severe is CVE-2012-5839?

This vulnerability has a CVSS 2.0 base score of 9.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2012-5839?

Check the references section for vendor advisories and patches from mozilla. Update firefox to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2012-5839?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2012-5839 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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