Description: Assessment technique for the attacks rate on the availability of commercial Web services and service components it’s considered in the article. The analysis of the persons performing the attack, their goals and motives, means exploitation of vulnerabilities. The hypothesis of Markov processes for the events of the attacks to the web service is formulated. A model for calculating the attack rate on web services is determined on the basis of its rate and critical attacks on the availability of services dns.
Keywords: attacks rate, vulnerability on availability, commercial web service, Markov models