CVE-2018-7857: Schneider Electric Modicon m340 Firmware

High severity, CVSS 7.5. EPSS: 1.6% 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 when writing out of bounds variables to the controller over Modbus.

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: before 3.20 (fixed in 3.20)
• Schneider Electric Modicon Quantum Firmware: before 3.60 (fixed in 3.60)

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