Cybersecurity is one of the most critical problems of connected vehicle networks that threaten the safety of personnel. Defense of Electronic Control Units (ECUs) and the Control Area Network (CAN) bus are the most critical elements in vehicles. Additionally, with the advent of 4G LTE and 5G remote communication security systems for vehicle-to-everything (V2X) communications, inter-vehicle communications security is another potential issue. The development of modern vehicular technologies has modified the conventional definition of defense, with a drastic growth in the application of electronic devices and wireless technology. In addition, the increasing interest in Vehicle Ad Hoc Networks ( VANETs) and Intelligent Transportation Systems (ITS) growth has included new security problems and vulnerabilities.