CVE-2019-6829: 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 Modicon M580 (firmware version prior to V2.90) and Modicon M340 (firmware version prior to V3.10), which could cause a possible denial of service when writing to specific memory addresses in 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)

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