The Industrial Internet of Things (IIoT) is a foundational pillar of Industry 4.0, enabling real-time data exchange and automation through the integration of smart sensors, actuators, and networked machinery. While this interconnectivity enhances operational efficiency and decision-making on the industrial floor, it also introduces complex cybersecurity challenges. This work reviews literature related to the IIoT with a focus on threat modeling techniques, including mitigation strategies. It comprises the theoretical frameworks and the implemented solutions within the domains of critical infrastructure and manufacturing. The coexistence of legacy control software systems, stringent real-time... More >