CVE-2012-3963: Canonical Ubuntu Linux

High severity, CVSS 10.0. EPSS: 5.9% chance of exploitation in the next 30 days.

Use-after-free vulnerability in the js::gc::MapAllocToTraceKind function in Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0, Thunderbird ESR 10.x before 10.0.7, and SeaMonkey before 2.12 allows remote attackers to execute arbitrary code via unspecified vectors.

Affected products

• Canonical Ubuntu Linux: version 10.04 only; version 11.04 only; version 11.10 only; version 12.04 only
• Mozilla Firefox: before 15.0 (fixed in 15.0); from 10.0, before 10.0.7 (fixed in 10.0.7)
• Mozilla Seamonkey: before 2.12 (fixed in 2.12)
• Mozilla Thunderbird: before 15.0 (fixed in 15.0)
• Mozilla Thunderbird ESR: from 10.0, before 10.0.7 (fixed in 10.0.7)
• Opensuse Opensuse: version 12.2 only
• Red Hat Enterprise Linux Desktop: version 5.0 only; version 6.0 only
• Red Hat Enterprise Linux Eus: version 6.3 only
• Red Hat Enterprise Linux Server: version 5.0 only; version 6.0 only
• Red Hat Enterprise Linux Server Eus: version 6.3 only
• Red Hat Enterprise Linux Workstation: version 5.0 only; version 6.0 only
• Suse Linux Enterprise Desktop: version 10 only; version 11 only
• Suse Linux Enterprise Server: version 10 only; version 11 only
• Suse Linux Enterprise Software Development Kit: version 11 only

Published 2012-08-29. Last modified 2026-06-16.