Modicon M580, M340, Quantum, Premium Controllers Security Notification

This security notification from Schneider Electric details multiple high-severity vulnerabilities (CVE-2019-6857, CVE-2019-6856, CVE-2018-7794) affecting Modicon M580, M340, Quantum, and Premium controllers. The vulnerabilities, caused by improper checks for unusual conditions (CWE-754), could allow denial of service via Modbus TCP, with firmware fixes provided for each affected product line.