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Vulnerability record · CVE-2020-7540 · published 11 December 2020

CVE-2020-7540: Schneider-electric modicon m340 bmxp341000 firmware missing authentication for critical function vulnerability

Schneider Electric · Modicon M340 Bmxp341000 Firmware

A CWE-306: Missing Authentication for Critical Function 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 unauthenticated command execution in the controller when sending special HTTP requests.

9.8 CVSS 3.1 Critical EPSS 2.3% · top 17.2% CWE-306 · Missing authentication for critical function
9.8CVSS 3.1 base score, v2 7.5
2.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
23Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A CWE-306: Missing Authentication for Critical Function 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 unauthenticated command execution in the controller when sending special HTTP requests.

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

Affected products

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

References

LinkTags
https://www.se.com/ww/en/download/document/SEVD-2020-343-04/ Vendor Advisory
https://www.se.com/ww/en/download/document/SEVD-2020-343-04/ Vendor Advisory

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Related vulnerabilities

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

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%7.5CVE-2021-22787Schneider-electric modicon m340 bmxp342020 firmware improper input validation vulnerabilityA CWE-20: Improper Input Validation vulnerability exists that could cause denial of service of the device when an attacker sends a specially crafted …EPSS 1.0%

Source: NIST National Vulnerability Database (record CVE-2020-7540), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.