Buffer overflow in Mercury MTA POP3 server for NetWare 1.48 and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary code via a long APOP command.
http://www.securityfocus.com/bid/2641
http://www.iss.net/security_center/static/6444.php
http://online.securityfocus.com/archive/1/179217
http://archives.neohapsis.com/archives/bugtraq/2001-04/0378.html