CVE-2020-7543

Name: CVE-2020-7543
Creator: NVD / NIST
Published: 2020-12-11T01:15:12.58+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.31%

Last modified Jun 17, 2026

CVE-2020-7543 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 1.31% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.31%

67.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-754

Affected Software

Vendor	Product	Versions
Schneider-Electric	Modicon M580 Bmep584040 Firmware	< 3.20
Schneider-Electric	Modicon M580 Bmep582040 Firmware	< 3.20
Schneider-Electric	Modicon M580 Bmep586040 Firmware	< 3.20
Schneider-Electric	Modicon M580 Bmep585040 Firmware	< 3.20
Schneider-Electric	Modicon M580 Bmep582020 Firmware	< 3.20
Schneider-Electric	Modicon M580 Bmep581020 Firmware	< 3.20
Schneider-Electric	Modicon M580 Bmep584020 Firmware	< 3.20
Schneider-Electric	Modicon M580 Bmep583040 Firmware	< 3.20
Schneider-Electric	Modicon M580 Bmep583020 Firmware	< 3.20
Schneider-Electric	Modicon M340 Bmxp341000 Firmware	< 3.30
Schneider-Electric	Modicon M340 Bmxp342000 Firmware	< 3.30
Schneider-Electric	Modicon M340 Bmxp3420102 Firmware	< 3.30
Schneider-Electric	Modicon M340 Bmxp3420102cl Firmware	< 3.30
Schneider-Electric	Modicon M340 Bmxp342020 Firmware	< 3.30
Schneider-Electric	Modicon M340 Bmxp3420302 Firmware	< 3.30
Schneider-Electric	Modicon M340 Bmxp3420302cl Firmware	< 3.30

References

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

Timeline

Published: Dec 11, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-7543?

How severe is CVE-2020-7543?

CVE-2020-7543 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.31% probability of exploitation in the next 30 days.

How do I fix CVE-2020-7543?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-7543?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST