CVE-2008-2785: Mozilla Firefox

High severity, CVSS 9.3. EPSS: 5.3% chance of exploitation in the next 30 days.

Mozilla Firefox before 2.0.0.16 and 3.x before 3.0.1, Thunderbird before 2.0.0.16, and SeaMonkey before 1.1.11 use an incorrect integer data type as a CSS object reference counter in the CSSValue array (aka nsCSSValue:Array) data structure, which allows remote attackers to execute arbitrary code via a large number of references to a common CSS object, leading to a counter overflow and a free of in-use memory, aka ZDI-CAN-349.

Affected products

• Mozilla Firefox: up to and including 2.0.0.15; version 2.0 only; version 2.0.0.1 only; version 2.0.0.2 only; version 2.0.0.3 only; version 2.0.0.4 only; …
• Mozilla Seamonkey: up to and including 1.1.10; 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 Thunderbird: up to and including 2.0.0.14; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; …

Published 2008-06-19. Last modified 2026-06-16.