Modern vehicles depend strongly on interconnected electronic control units (ECUs), which makes in-vehicle networks gradually vulnerable to cyber threats. The Controller Area Network (CAN) bus, while necessary for real-time vehicle communication, was not initially designed by keeping cybersecurity in mind which leaves it exposed to certain attacks such as message injection, replay, fuzzing, and denial-of-service (DoS).

This white paper gives a standardized and practical approach to cybersecurity validation of CAN based automotive networks, focusing on penetration testing techniques, practical attack scenarios, and hardware-based validation methods. It emphasizes how manufacturers and suppliers can identify security gaps early and harden vehicle resilience against real-world cyberattacks.