[takeda]

Yep. Jeep Cherokee was hacked by connecting to multimedia system which supposed to be separate from driving system, yet our wasn't a problem.

All they had to was reprogram one of controllers and full access was granted.

Even if you don't reprogram controllers you don't have guarantee that some components won't go high wire when your modded version dies something different.

The best approach would be if manufacturers would provide an air gap, but they probably won't, to save costs.