1. An event that can compromise your network security. 2. A threat (such as a virus, worm or Trojan horse) or a security risk (such as adware and spyware).

The risk rating is an overall assessment of hazards posed by an instance of a malicious code or a security risk. The degree of risk is calculated from the values of Infection Potential, Prevalence, Impact, and Target Distribution. The rating ranges from a low of 1 to a high of 5.