My fav is IPMI. Many devices allow you to log in using cipher 0... basically, if you know the username, you get access. The rest... well, IMPI has a hash disc

My fav is IPMI. Many devices allow you to log in using cipher 0... basically, if you know the username, you get access. The rest... well, IMPI has a hash disclosure built into the protocol. If you can guess a username, you can get (and try to crack) the password.