CVE-2005-3402: Mozilla Thunderbird

Low severity, CVSS 2.6. EPSS: 1.1% chance of exploitation in the next 30 days.

The SMTP client in Mozilla Thunderbird 1.0.5 BETA, 1.0.7, and possibly other versions, does not notify users when it cannot establish a secure channel with the server, which allows remote attackers to obtain authentication information without detection via a man-in-the-middle (MITM) attack that bypasses TLS authentication or downgrades CRAM-MD5 authentication to plain authentication.

Affected products

• Mozilla Thunderbird: version 1.0.5 only; version 1.0.7 only

Published 2005-11-01. Last modified 2026-06-16.