CVE-2019-6808: Schneider Electric Modicon m340 Firmware

Critical severity, CVSS 9.8. EPSS: 8.2% chance of exploitation in the next 30 days.

A CWE-284: Improper Access Control vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause a remote code execution by overwriting configuration settings of the controller over Modbus.

Affected products

• Schneider Electric Modicon m340 Firmware: before 3.10 (fixed in 3.10)
• Schneider Electric Modicon m580 Firmware: before 2.90 (fixed in 2.90)
• Schneider Electric Modicon Premium Firmware: up to and including 3.20
• Schneider Electric Modicon Quantum Firmware: up to and including 3.60

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