Optimal response to computer network threats

Mitigating security threats is a big challenge for network administrator, because threats can be exploited by attackers and lead to a cyber-attack. Therefore, network administrator should spend budget to eliminate vulnerabilities and prevent attacks. Removing all the vulnerabilities is not cost-effective and in some cases impractical. The primary goal of this paper is to prioritize network nodes based on their position in the attack graph and importance to immunize them against threat. We have introduced a model to calculate threat based on the weighted attack graph. Next, we propose a multi-objective threat response model to minimize the network threat and cost. Experiments show that our system can suggest proper response based on the current state of the network and our threat response system can immunize the network efficiently.