User blog comment:IamThorn/Can Penny be hacked?/@comment-11188061-20141123052544

The point is that as long as Penny has any kind of established wireless contact with anything, it can be a point to initiate hacking. And that is highly likely - what good's a combat robot who has to communicate through flying pigeons?

Also, considering that she is a prototype, a secret weapon and a highly valuable experiment, she very likely has an emergency shut down button of some kind just in case she goes berserk. There you have your internal system hacking point.