CVE-2009-2535: Mozilla Firefox

Medium severity, CVSS 5.0. EPSS: 9.4% chance of exploitation in the next 30 days.

Mozilla Firefox before 2.0.0.19 and 3.x before 3.0.5, SeaMonkey, and Thunderbird allow remote attackers to cause a denial of service (memory consumption and application crash) via a large integer value for the length property of a Select object, a related issue to CVE-2009-1692.

Affected products

• Mozilla Firefox: up to and including 2.0.0.18; version 0.1 only; version 0.2 only; version 0.4 only; version 0.6 only; version 0.6.1 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 2.0.0.18; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; …

Published 2009-07-20. Last modified 2026-06-16.