Modern vehicles rely on an important network of interconnected Electronic Control Units (ECU) to manage critical functionalities from engine control and braking to steering and active aerodynamics. As those subsystems become more intricate software-defined structures, they have become more interesting targets to the cybercriminal world. The increasing connectivity is making the management of such systems more concentrated on the security aspect of the implementation. Ensuring the integrity, confidentiality, and availability of ECU communications, as one of the most important components in the vehicle information flow, is essential for both the vehicle's performance and the driver's safety. The risk landscape has motivated researchers to study the automotive communication protocols and diagnostic services for potential vulnerabilities that could be exploited for any possible malicious use.