Systems, methods, and products comprise an analytic server, which improves security of a unified system of distributed network infrastructure comprising a plurality of cyber-physical systems. The analytic server may instantiate a sub attack tree for each cyber-physical system within the unified system. The analytic server may determine how the interconnection of the plurality of cyber-physical systems may affect the unified system security. The analytic server may monitor systems and receive electronic notifications of alerts in real-time from devices in the plurality of cyber-physical systems. The analytic server may follow the logic of the attack tree model by traversing the attack tree from bottom up and determine how the alerts from the cyber-physical systems may affect the distributed network infrastructure as a whole. The analytic server may generate reports comprising a list of the prioritized attacks and recommendation actions to mitigate the attacks.