This guide outlines the importance of security testing within the automotive industry, emphasizing its role in identifying exploitable flaws and vulnerabilities in hardware and software implementations. It details how effective security testing contributes to reducing safety, financial, operational, and legal risks associated with increasing connectivity and automation. The document discusses the challenges of ensuring regulatory compliance with international and local regulations, such as UN R-155 and ISO/SAE 21434. It presents the services offered by ETAS, including the development of customized security testing strategies tailored to an organization's specific needs and cyber maturity level. The guide also highlights various consulting services, training programs, and ongoing support options designed to enhance the cybersecurity validation and verification activities of companies. By focusing on the complexities of security testing, the document aims to assist organizations in establishing robust cybersecurity measures aligned with global standards.