Today, all devices are connected to networks and the cloud. Security measures for embedded systems/IoT systems are becoming increasingly important. Standardization, laws, and regulations regarding security, SBOM, etc. are progressing both domestically and internationally. Therefore, security measures have become an urgent need. This session will introduce security trends in embedded systems/IoT systems. Next, we will explain security threats and security measures that should be taken into consideration from the perspective of RTOS and hypervisor, which are the foundation software for embedded systems.