WFTPD Pro Server 3.21 Release 1, with the XeroxDocutech option enabled, allows local users to cause a denial of service (crash) via a (1) MKD or (2) XMKD command that causes an absolute path of 260 characters to be used, which overwrites a cookie with a null character, possibly due to an off-by-one error.
https://exchange.xforce.ibmcloud.com/vulnerabilities/15342
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-0342
http://www.securityfocus.com/bid/9767