Modicon M340 Controller Security Notification

This document details a high-severity denial-of-service vulnerability (CVE-2019-6813) in all firmware versions of the Schneider Electric Modicon M340 controller, caused by improper handling of truncated SNMP packets on port 161/UDP. It provides remediation steps including network segmentation, firewall blocking of SNMP port 161, and general cybersecurity best practices for industrial control systems.