Buffer overflow in FTP Serv-U 2.5 allows remote authenticated users to cause a denial of service (crash) via a long (1) CWD or (2) LS (list) command.
https://exchange.xforce.ibmcloud.com/vulnerabilities/205
https://euvd.enisa.europa.eu/vulnerability/EUVD-1999-0219
http://www.securityfocus.com/bid/269