CVE-2019-6819: Schneider Electric Modicon m340 Firmware

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists which could cause a possible Denial of Service when specific Modbus frames are sent to the controller in the products: Modicon M340 - firmware versions prior to V3.01, Modicon M580 - firmware versions prior to V2.80, All firmware versions of Modicon Quantum and Modicon Premium.

Affected products

• Schneider Electric Modicon m340 Firmware: before 3.01 (fixed in 3.01)
• Schneider Electric Modicon m580 Firmware: before 2.80 (fixed in 2.80)
• Schneider Electric Modicon Premium Firmware: any version
• Schneider Electric Modicon Quantum Firmware: any version

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