Robots are becoming increasingly integrated in our daily lives, providing services in civilian, industrial and
military applications. Many of those applications require robots to be remotely operated and controlled through
communication channels. This makes the robotic system susceptible to a class of attacks targeting the connection
between the controlling client and the robot, which can render the robot unavailable. The objective of our research
is to identify, estimate and prioritize the risks associated with attacks targeting the availability of the robotic
system. To achieve our objective, we perform an impact oriented semi-quantitative risk assessment of the loss of
availability on the well-known PeopleBot™ mobile robot platform. We experimented with several well-known
attacks that can target and affect the availability of the robot. To examine the cyber-physical impacts of the attacks
on the robotic system, we setup a ten-goal test area and constructed a 2D map. The robot was programmed to tour
the test area while being targeted by cyber-attacks. The physical impacts of the attacks are demonstrated in this
paper. The results indicate that attacks can potentially lead to loss of availability which may result in serious
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