Core FTP Server 1.2 before build 515 allows remote attackers to cause a denial of service (reachable assertion and crash) via an AUTH SSL command with malformed data, as demonstrated by pressing the enter key twice.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-1517
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