CVE-2019-6843

Severity: medium (CVSS 4.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-10-29 · updated 2026-06-17
Weakness: CWE-755

Description

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: all versions
Schneider-Electric Modicon Bmxcra Firmware: all versions
Schneider-Electric Modicon M340 Firmware: all versions
Schneider Electric SE Modicon M580: all versions

References

https://www.se.com/ww/en/download/document/SEVD-2019-281-02/
https://www.se.com/ww/en/download/document/SEVD-2019-281-02/

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