CVE-2018-7849: Schneider Electric Modicon m340 Firmware

High severity, CVSS 7.5. EPSS: 3.3% chance of exploitation in the next 30 days.

A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum and Modicon Premium which could cause a possible Denial of Service due to improper data integrity check when sending files the controller over Modbus.

Affected products

• Schneider Electric Modicon m340 Firmware: any version
• Schneider Electric Modicon m580 Firmware: any version
• Schneider Electric Modicon Premium Firmware: any version
• Schneider Electric Modicon Quantum Firmware: any version

Published 2019-05-22. Last modified 2026-06-17.