Quick 'n Easy FTP Server 3.0 allows remote attackers to cause a denial of service (application crash or CPU consumption) via a long USER command.
https://exchange.xforce.ibmcloud.com/vulnerabilities/21679
http://www.securityfocus.com/bid/14451
http://www.securityfocus.com/archive/1/428812/100/0/threaded
http://securitytracker.com/id?1014615
http://marc.info/?l=bugtraq&m=112319110831249&w=2