Blockchain technology has become a paradigm shift to digital transactions. It has brought massive potentials in many fields, such as financial services, energy, healthcare and Internet of Things. As often occurs with innovative technologies, it has suffered from several critical Cybersecurity threats and vulnerabilities. The complicated relation between Cybersecurity risk management and companies strategic and operational objectives which make identifying, analyzing, and controlling the relevant risk events as a major challenge. In this paper, the researchers classify those incidents against the Cybersecurity vulnerabilities in Blockchain technology and explain the methods of risk measures according to the Information Security Risk Assessment (ISRA) Models.