Typsoft FTP Server 1.11, with "Sub Directory Include" enabled, allows remote attackers to cause a denial of service (crash) by sending multiple RETR commands. NOTE: it was later reported that 1.10 is also affected.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-3293
http://www.securityfocus.com/bid/15104
http://www.exploitlabs.com/files/advisories/EXPL-A-2005-016-typsoft-ftpd.txt