CVE-2011-3659: Mozilla Firefox

High severity, CVSS 9.3. EPSS: 36.8% chance of exploitation in the next 30 days.

Use-after-free vulnerability in Mozilla Firefox before 3.6.26 and 4.x through 9.0, Thunderbird before 3.1.18 and 5.0 through 9.0, and SeaMonkey before 2.7 might allow remote attackers to execute arbitrary code via vectors related to incorrect AttributeChildRemoved notifications that affect access to removed nsDOMAttribute child nodes.

Affected products

• Mozilla Firefox: before 3.6.26 (fixed in 3.6.26); from 4.0, before 10.0 (fixed in 10.0)
• Mozilla Seamonkey: before 2.7 (fixed in 2.7)
• Mozilla Thunderbird: before 3.1.18 (fixed in 3.1.18); from 5.0, before 10.0 (fixed in 10.0)
• Opensuse Opensuse: version 11.4 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 10 only; version 11 only

Published 2012-02-01. Last modified 2026-06-16.