FTGate and FTGate Pro 1.05 lock user mailboxes before authentication succeeds, which allows remote attackers to lock the mailboxes of other users.
http://www.securityfocus.com/bid/4429
http://www.iss.net/security_center/static/8751.php
http://archives.neohapsis.com/archives/bugtraq/2002-04/0053.html