CVE-2005-3402

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.