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To enhance security in dynamic networks, it is important to evaluate the vulnerabilities and offer economic and practical patching strategy since vulnerability is the major driving force for attacks. In this paper, a hybrid ranking approach is presented to estimate vulnerabilities under the dynamic scenarios, which is a combination of low-level rating for vulnerability instances and high-level evaluation for the security level of the network system. Moreover, a novel quantitative model, andoi:10.1016/j.camwa.2011.09.031 fatcat:xbgrbcld3vanrj47y3ix3rsjmi