CVE-2005-0147: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

Firefox before 1.0 and Mozilla before 1.7.5, when configured to use a proxy, respond to 407 proxy auth requests from arbitrary servers, which allows remote attackers to steal NTLM or SPNEGO credentials.

Affected products

• Mozilla Firefox: version 0.8 only; version 0.9 only; version 0.9.1 only; version 0.9.2 only; version 0.9.3 only
• Mozilla Mozilla: version 1.7 only; version 1.7.1 only; version 1.7.2 only; version 1.7.3 only

Published 2005-05-02. Last modified 2026-06-16.