Core FTP Server 1.2 before build 515 allows remote authenticated users to obtain sensitive information (password for the previous user) via a USER command with a specific length, possibly related to an out-of-bounds read.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-1519
http://secunia.com/advisories/56850
http://seclists.org/fulldisclosure/2014/Feb/39
http://packetstormsecurity.com/files/125073/Core-FTP-Server-1.2-DoS-Traversal-Disclosure.html