A very eloquent and informative title
And then there's the problem of Mr. Joe A. Hacker taking over your network. Remotely. Without the need to find an OS-specific vulnerability. Absolutely fantastic.
Remote-access BIOS 'Trojans' like vPro are risky in a LAN and need careful consideration of risks and advantages - but allowing access from the internet at large? That's cracker's (and orwellian government's) wet dream...