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Vulnerability record · CVE-2020-7539 · published 11 December 2020

CVE-2020-7539: Schneider-electric modicon m340 bmxp341000 firmware vulnerability

Schneider Electric · Modicon M340 Bmxp341000 Firmware

A CWE-754 Improper Check for Unusual or Exceptional Conditions vulnerability exists in the Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium and associated Communication Modules (see security notification for affected versions), that could cause a denial of service vulnerability when a specially crafted packet is sent to the controller over HTTP.

7.5 CVSS 3.1 High EPSS 1.2% · top 33.2% CWE-754 · CWE-754
7.5CVSS 3.1 base score, v2 5.0
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
20Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A CWE-754 Improper Check for Unusual or Exceptional Conditions vulnerability exists in the Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium and associated Communication Modules (see security notification for affected versions), that could cause a denial of service vulnerability when a specially crafted packet is sent to the controller over HTTP.

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

Affected products

20 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.se.com/ww/en/download/document/SEVD-2020-343-03/ Vendor Advisory
https://www.se.com/ww/en/download/document/SEVD-2020-343-03/ Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-7540Schneider-electric modicon m340 bmxp341000 firmware missing authentication for critical function vulnerabilityA CWE-306: Missing Authentication for Critical Function vulnerability exists in the Web Server on Modicon M340, Legacy Offers Modicon Quantum and Mod…EPSS 2.3%9.8CVE-2020-7533Schneider-electric modicon m340 bmxp3420302 firmware improper authentication vulnerabilityCWE-287: Improper Authentication vulnerability exists which could cause the execution of commands on the webserver without authentication when sendin…EPSS 2.3%9.8CVE-2018-7241Schneider-electric bmxnor0200 firmware hard-coded credentials vulnerabilityHard coded accounts exist in Schneider Electric's Modicon Premium, Modicon Quantum, Modicon M340, and BMXNOR0200 controllers in all versions of the c…EPSS 3.7%9.8CVE-2018-7242Schneider-electric bmxnor0200 firmware inadequate encryption strength vulnerabilityVulnerable hash algorithms exists in Schneider Electric's Modicon Premium, Modicon Quantum, Modicon M340, and BMXNOR0200 controllers in all versions …EPSS 1.9%9.8CVE-2018-7760Schneider-electric bmxnor0200 firmware improper authentication vulnerabilityAn authorization bypass vulnerability exists in Schneider Electric's Modicon M340, Modicon Premium, Modicon Quantum PLC, BMXNOR0200. Requests to CGI …EPSS 1.5%9.8CVE-2018-7761Schneider-electric bmxnor0200 firmware improper input validation vulnerabilityA vulnerability exists in the HTTP request parser in Schneider Electric's Modicon M340, Modicon Premium, Modicon Quantum PLC, BMXNOR0200 which could …EPSS 2.1%8.8CVE-2020-7534Schneider-electric modicon m340 bmxp342020 firmware cross-site request forgery vulnerabilityA CWE-352: Cross-Site Request Forgery (CSRF) vulnerability exists on the web server used, that could cause a leak of sensitive data or unauthorized a…EPSS 0.36%8.8CVE-2018-7240Schneider-electric 140cpu65150 firmware out-of-bounds write vulnerabilityA vulnerability exists in Schneider Electric's Modicon Quantum in all versions of the communication modules which could allow arbitrary code executio…EPSS 3.2%

Source: NIST National Vulnerability Database (record CVE-2020-7539), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.