Ipswitch WS_FTP Server 4.0.2 allows remote attackers to cause a denial of service (disk consumption) and bypass file size restrictions via a REST command with a large size argument, followed by a STOR of a smaller file.
https://exchange.xforce.ibmcloud.com/vulnerabilities/41831
https://exchange.xforce.ibmcloud.com/vulnerabilities/15560
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-1841
http://www.securityfocus.com/bid/9953
http://securitytracker.com/id?1009529