Nowadays vehicles have got a significant amount of on-board computers; moreover, the number of electronic components installed in vehicles will definitely increase in the next years due to emerging technologies such as autonomous driving systems. Modern vehicles, therefore, should be considered as complex IT/OT systems characterized by a large attack surface that leads to significant cybersecurity risks. Additionally, it should be noted that vehicles are safety-critical environments, meaning that possible vulnerabilities exploited by cyber-criminals could lead to catastrophic consequences for people (i.e. passengers) and for the vehicle manufacturer. The in-vehicle communication network generally relies on the Controller Area Network protocol (CAN-bus), which still suffers from various vulnerabilities because of the lack of security measures.