You might be read about the previous post ScriptFTP Remote BOF, if you are a Metasploit user, you can add this exploit module to your Metasploit Framework.
Update:
Metasploit has released module for ScriptFTP. You can use it now on Metasploit. .
Credit goes to:
- Cyberheb
- Otoy
- TecR0c
- mr_me