Ipswitch WS_FTP Server 5.04 allows FTP site administrators to execute arbitrary code on the system via a long input string to the (1) iFTPAddU or (2) iFTPAddH file, or to a (3) edition module.
https://exchange.xforce.ibmcloud.com/vulnerabilities/32176
http://www.securityfocus.com/archive/1/459023/100/0/threaded
http://www.securityfocus.com/archive/1/458942/100/0/threaded
http://www.securityfocus.com/archive/1/458932/100/0/threaded
http://www.securityfocus.com/archive/1/458774/100/0/threaded