CVE-2009-2477: Mozilla Firefox

High severity, CVSS 9.3. EPSS: 42.7% chance of exploitation in the next 30 days.

js/src/jstracer.cpp in the Just-in-time (JIT) JavaScript compiler (aka TraceMonkey) in Mozilla Firefox 3.5 before 3.5.1 allows remote attackers to execute arbitrary code via certain use of the escape function that triggers access to uninitialized memory locations, as originally demonstrated by a document containing P and FONT elements.

Affected products

• Mozilla Firefox: version 3.5 only

Published 2009-07-15. Last modified 2026-06-16.