Most are. GM OnStar systems & Tesla I know for sure are designed in a way that a malicious hack of HQ computers + research into car firmware could lead to a push that would kill potentially millions of people simultaneously. If I really dived into the others, I wouldn't be surprised if ford, VW, toyota and others had similar system design issues.

We are just lucky we live in a world where even 'hackers' don't go that low. I hope future regulation will mandate remote access airgaps. I don't think it's a big price to pay for non-entertainment / GPS software updates to require a physical connection

> We are just lucky we live in a world where even 'hackers' don't go that low.

Unfortunately they do go that low. There have been multiple murders committed by ransomware gangs attacking European and US hospitals in recent months. Example: https://arstechnica.com/information-technology/2020/09/patie...

That's more spray and pray damage then a specific hack on hospitals.

Modern ransomware attacks do recon and exfiltration for weeks or months before pulling the encryption trigger.

The attackers knew it was a hospital network and clearly didn’t care that people would die.

How's it going to unlock the car if it's not talking to the important parts?

Sure someone could make a dedicated secure unlock wire or something, but they don't.