CVE-2009-2465: Mozilla Firefox

High severity, CVSS 10.0. EPSS: 5.4% chance of exploitation in the next 30 days.

Mozilla Firefox before 3.0.12 and Thunderbird allow remote attackers to cause a denial of service (memory corruption and application crash) or execute arbitrary code via vectors involving double frame construction, related to (1) nsHTMLContentSink.cpp, (2) nsXMLContentSink.cpp, and (3) nsPresShell.cpp, and the nsSubDocumentFrame::Reflow function.

Affected products

• Mozilla Firefox: up to and including 3.0.11; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; …
• Mozilla Thunderbird: version 2.0.0.0 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; version 2.0.0.5 only; …

Published 2009-07-22. Last modified 2026-06-16.