This project investigates how to incorporate temporal cyber threat intelligence (CTI) into infrastructure-grounded attack graph analysis in order to compute realistic attacker reachability, attack-path likelihoods, and vulnerability heatmaps over enterprise systems. The framework combines a MAL/coreLang-style attack graph with MITRE ATT&CK technique mappings and ChronoCTI temporal relations between techniques to model how attackers plausibly progress through infrastructure over time.