CAV (connected and autonomous vehicle) is a crucial part of intelligent transportation systems. CAVs utilize both sensors and\ncommunication components to make driving decisions. A large number of companies, research organizations, and governments\nhave researched extensively on the development of CAVs. The increasing number of autonomous and connected functions\nhowever means that CAVs are exposed to more cyber security vulnerabilities. Unlike computer cyber security attacks, cyber\nattacks to CAVs could lead to not only information leakage but also physical damage. According to the UK CAV Cyber Security\nPrinciples, preventing CAVs from cyber security attacks need to be considered at the beginning of CAV development. In this\npaper, a large set of potential cyber attacks are collected and investigated from the aspects of target assets, risks, and consequences.\nSeverity of each type of attacks is then analysed based on clearly defined new set of criteria.
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