Buffer overflow in XM Easy Personal FTP Server 4.3 and earlier allows remote attackers to execute arbitrary code, probably via a USER command with a long username.
https://exchange.xforce.ibmcloud.com/vulnerabilities/26256
http://www.vupen.com/english/advisories/2006/1673
http://www.securityfocus.com/bid/17836
http://www.securityfocus.com/archive/1/432960/100/0/threaded