FTP

PORT   STATE SERVICE REASON          VERSION
21/tcp open  ftp     syn-ack ttl 127 FileZilla ftpd 0.9.41 beta
| ftp-syst: 
|_  SYST: UNIX emulated by FileZilla
|_banner: 220-FileZilla Server version 0.9.41 beta
Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows

All the exploits available to us are DOS.