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Modicon M340 Controller Security Notification

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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.

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