Format string vulnerability in Ipswitch WS_FTP Home 2007.0.0.2 and WS_FTP Professional 2007.1.0.0 allows remote FTP servers to cause a denial of service (application crash) or possibly execute arbitrary code via format string specifiers in a connection greeting (response).
https://www.exploit-db.com/exploits/6257
https://exchange.xforce.ibmcloud.com/vulnerabilities/44512
http://www.securitytracker.com/id?1020714
http://www.securitytracker.com/id?1020713