FTPGetter Professional 5.97.0.223 is vulnerable to a memory corruption bug when a user sends a specially crafted string to the application. This memory corruption bug can possibly be classified as a NULL pointer dereference.
https://www.exploit-db.com/exploits/47871
http://packetstormsecurity.com/files/155832/FTPGetter-Professional-5.97.0.223-Denial-Of-Service.html