The paper assesses the continuity of web-systems up-state. It’s determined that the reasons for the unavailability of services can be both intra and external factors, among which are the attacks on the server-side vulnerabilities. Three Markov’s models of functioning web-based system considering software faults and execution of attacks on vulnerable services DNS, DHCP, and Route are developed. Eliminating configuration vulnerabilities during system operation is taken into account. The modeling outcomes allow concluding the effect of the probability of detecting and eliminating vulnerabilities, and speed recovery system on the behavior of readiness. Software package MATLAB is applied for service modeling.
availability model, service-oriented web-system, the vulnerability of availability