Format string vulnerability in Ipswitch WS_FTP Professional 12 before 12.2 allows remote attackers to cause a denial of service (crash) via format string specifiers in the status code portion of an HTTP response.
https://exchange.xforce.ibmcloud.com/vulnerabilities/53098
https://euvd.enisa.europa.eu/vulnerability/EUVD-2009-4738
http://www.securityfocus.com/bid/36297
http://www.packetstormsecurity.org/0909-exploits/nocoolnameforawsftppoc.pl.txt