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Overall Risk
Once the likelihood of occurrence and impact have been determined, you can then determine the overall risk rating, which is defined as a function of the two ratings. The overall risk can be rated Low, Medium, or High, which provides guidance to those responsible for securing and maintaining the systems in question.
• High: There is a strong requirement for additional measures to be implemented to protect against the vulnerability. In some cases, the system may be allowed to continue operating but a plan must be designed and implemented as soon as possible.
• Medium: There is a requirement for additional measures to be implemented to protect against the vulnerability. A plan to implement the required measures must be done in a timely manner.
• Low: The owner of the system will determine whether to implement additional measures to protect against the vulnerability or they can opt to accept the risk instead and leave the system unchanged.