CVE-2011-2373: Mozilla Firefox

High severity, CVSS 7.6. EPSS: 5% chance of exploitation in the next 30 days.

Use-after-free vulnerability in Mozilla Firefox before 3.6.18 and 4.x through 4.0.1, Thunderbird before 3.1.11, and SeaMonkey through 2.0.14, when JavaScript is disabled, allows remote attackers to execute arbitrary code via a crafted XUL document.

Affected products

• Mozilla Firefox: up to and including 3.6.17; version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.0.4 only; …
• Mozilla Seamonkey: version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.0.4 only; version 1.0.5 only; …
• Mozilla Thunderbird: up to and including 3.1.10; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; …

Published 2011-06-30. Last modified 2026-06-16.