CVE-2009-2061: Mozilla Firefox

High severity, CVSS 9.3. EPSS: 1.2% chance of exploitation in the next 30 days.

Mozilla Firefox before 3.0.10 processes a 3xx HTTP CONNECT response before a successful SSL handshake, which allows man-in-the-middle attackers to execute arbitrary web script, in an https site's context, by modifying this CONNECT response to specify a 302 redirect to an arbitrary https web site.

Affected products

• Mozilla Firefox: up to and including 3.0.9; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; …

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