We went through all of this hysteria 14-1/2 years ago. (13-1/2 if you're a purist) Anyone remember Y2K? Anything that is controlled remotely (i.e., by means of an external network) can theoretically be controlled by anyone who has access to that network. That's the definition of "remote control".

But, if any appliance is NOT controlled by a network, it can't be hacked remotely.