CVE-2019-6843: Schneider Electric Modicon 140cra Firmware

Medium severity, CVSS 4.9. EPSS: 1% chance of exploitation in the next 30 days.

A CWE-755: Improper Handling of Exceptional Conditions vulnerability exists in Modicon M580 with firmware (version prior to V3.10), Modicon M340 (all firmware versions), and Modicon BMxCRA and 140CRA modules (all firmware versions), which could cause a Denial of Service attack on the PLC when upgrading the controller with an empty firmware package using FTP protocol.

Affected products

• Schneider Electric Modicon 140cra Firmware: any version
• Schneider Electric Modicon Bmxcra Firmware: any version
• Schneider Electric Modicon m340 Firmware: any version
• Schneider Electric Modicon m580 Firmware: any version

Published 2019-10-29. Last modified 2026-06-17.