We have released simple and user friendly GUI FTP fuzzer tool for stress testing FTP server implementations. It is quite configurable tool, which means that you can precisely define which FTP commands will be fuzzed with the parameter size and test strings.
Running this fuzzer against FTP server implementations resulted in uncovering numerous security vulnerabilities (overflows, format strings) in various FTP servers. After short period of fuzzing, fuzzer revealed buffer overflow vulnerabilities in for example:
You can download it from: http://www.infigo.hr/files/ftpfuzz.zip
Regards, Leon Juranic