Cars are also different in that software updates are harder to pull off. There are millions of cars out there on the road right now that have internet connectio

Cars are also different in that software updates are harder to pull off. There are millions of cars out there on the road right now that have internet connections, and only minimal security between human-convenience internet like map software, and the embedded systems that do things like steering and brakes. And the average lifespan of a car is what, 15 years? Whatever the vulnerabilities, they're going to be there for a long time. And even if there's a firmware update mechanism available, the manufacturers' abilities to maintain older software will also degrade, like legacy systems do everywhere.