HPUX FTPd vulnerability

Hello, I have discovered HPUX ftpd remote vulnerability. The problem persists in using vsprintf without format string. Example: 220 xxx FTP server Version 1.7.212.2 Tue Apr 21 12:14:46 GMT 1998 ready. user ftp 331 Guest login ok, send ident as password. pass .1030d 230 Guest login ok, access...