Buffer overflow in XM Easy Personal FTP Server 4.2 and 5.0.1 allows remote authenticated users to cause a denial of service via a long argument to the PORT command.
https://www.exploit-db.com/exploits/1552
http://www.securityfocus.com/bid/18711
http://www.packetstormsecurity.org/0606-exploits/xmepftp.txt