Continuous improvements in the hardware, software and algorithms of unmanned vehicles (UVs) are nearing their mass deployment in all physical environments, including within unmanned groups, and with traditional means of transport controlled by the operators (drivers). Notwithstanding the measures taken to improve security and resilience, UVs as complicated cyberphysical systems have a number of vulnerabilities and failure points. This paper comprises the review of known vulnerabilities and failure points (including those in group control scenarios), and the development of the proposals to improve the resilience and security of UVs, and addresses the identified issues.