Cisco VG248 login password is blank

The remote host is a Cisco VG248 with a blank password. The Cisco VG248 does not have a password set and allows direct access to the configuration interface. An attacker could telnet to the Cisco unit and reconfigure it to lock the owner out as well as completely disable the phone system.
Telnet to this unit and at the configuration interface: Choose Configure-> and set the login and enable passwords. If possible, in the future do not use telnet since it is an insecure protocol.