CVE-2010-3778: Mozilla Firefox

High severity, CVSS 9.3. EPSS: 8.1% chance of exploitation in the next 30 days.

Unspecified vulnerability in Mozilla Firefox 3.5.x before 3.5.16, Thunderbird before 3.0.11, and SeaMonkey before 2.0.11 allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

Affected products

• Mozilla Firefox: version 3.5 only; version 3.5.1 only; version 3.5.2 only; version 3.5.3 only; version 3.5.4 only; version 3.5.5 only; …
• Mozilla Seamonkey: any version; up to and including 2.0.10; version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; …
• Mozilla Thunderbird: up to and including 3.0.10; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; …

Published 2010-12-10. Last modified 2026-06-16.