CVE-2012-5830: Canonical Ubuntu Linux

High severity, CVSS 8.8. EPSS: 3.8% chance of exploitation in the next 30 days.

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.

Affected products

• Canonical Ubuntu Linux: version 10.04 only; version 11.10 only; version 12.04 only; version 12.10 only
• Mozilla Firefox: before 17.0 (fixed in 17.0); from 10.0, before 10.0.11 (fixed in 10.0.11)
• Mozilla Seamonkey: before 2.14 (fixed in 2.14)
• Mozilla Thunderbird: before 17.0 (fixed in 17.0)
• Mozilla Thunderbird ESR: from 10.0, before 10.0.11 (fixed in 10.0.11)
• Opensuse Opensuse: version 11.4 only; version 12.1 only; 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 Suse Linux Enterprise Desktop: version 10 only; version 11 only
• Suse Suse Linux Enterprise Server: version 10 only; version 11 only
• Suse Suse Linux Enterprise Software Development Kit: version 11.0 only

Published 2012-11-21. Last modified 2026-06-16.