CVE-2009-3373: Mozilla Firefox

High severity, CVSS 10.0. EPSS: 15.5% chance of exploitation in the next 30 days.

Heap-based buffer overflow in the GIF image parser in Mozilla Firefox before 3.0.15 and 3.5.x before 3.5.4, and SeaMonkey before 2.0, allows remote attackers to execute arbitrary code via unspecified vectors.

Affected products

• Mozilla Firefox: version 3.0 only; version 3.0.1 only; version 3.0.2 only; version 3.0.3 only; version 3.0.4 only; version 3.0.5 only; …
• Mozilla Seamonkey: up to and including 1.5.0.10; version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.0.4 only; …

Published 2009-10-29. Last modified 2026-06-16.