Modicon M221 and M241 PLC Security Notification

This document is a security notification from Schneider Electric addressing a proof-of-concept ransomware attack (LogicLocker) targeting exposed Modicon M221 and M241 PLCs, presented at an RSA conference. It outlines the attack scenario, affected products, and provides detailed mitigation steps including password protection, disabling unused protocols, network segmentation, and general cybersecurity best practices.