CVE-2020-7543

moderate-risk

Published 2020-12-11

A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Legacy Controllers Modicon Quantum & Modicon Premium (see security notifications for affected versions), that could cause denial of service when a specially crafted Read Physical Memory request over Modbus is sent to the controller.

Do I need to act?

0.39% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.5/10 High

NETWORK / LOW complexity

Affected Products (16)

Modicon M580 Bmep584040 Firmware

Modicon M580 Bmep582040 Firmware

Modicon M580 Bmep586040 Firmware

Modicon M580 Bmep585040 Firmware

Modicon M580 Bmep582020 Firmware

Modicon M580 Bmep581020 Firmware

Modicon M580 Bmep584020 Firmware

Modicon M580 Bmep583040 Firmware

Modicon M580 Bmep583020 Firmware

Modicon M340 Bmxp341000 Firmware

Modicon M340 Bmxp342000 Firmware

Modicon M340 Bmxp3420102 Firmware

Modicon M340 Bmxp3420102Cl Firmware

Modicon M340 Bmxp342020 Firmware

Modicon M340 Bmxp3420302 Firmware

Modicon M340 Bmxp3420302Cl Firmware

Affected Vendors

Schneider-Electric

References (2)

Vendor Advisory https://www.se.com/ww/en/download/document/SEVD-2020-343-08/

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moderate-risk

Severity 26/34 · High

Exploitability 1/34 · Minimal

Exposure 18/34 · Moderate