CVE-2019-6809: Schneider Electric Modicon m340 Firmware

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

A CWE-248: Uncaught Exception vulnerability exists in Modicon M580 (firmware versions prior to V2.90), Modicon M340 (firmware versions prior to V3.10), Modicon Premium (all versions), Modicon Quantum (all versions), which could cause a possible denial of service when reading invalid data from the controller.

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: any version
• Schneider Electric Modicon Quantum Firmware: any version

Published 2019-09-17. Last modified 2026-06-17.