Security researchers have discovered a critical security vulnerability in the CAN (controller area network) protocol that car components use to communicate to one another within the car’s network. If exploited, the vulnerability could eventually allow attackers to turn off crucial safety functions of a vehicle, such as airbags, power-steering, parking sensors, and the anti-lock brakes. The vulnerability can’t be directly patched with an OTA (on-the-air) upgrade or dealer recall, so there is no remedy to the problem yet.
Source: https://thehackernews.com/2017/08/car-safety-hacking.html