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Vulnerability record · CVE-2020-7533 · published 1 December 2020

CVE-2020-7533: Schneider-electric modicon m340 bmxp3420302 firmware improper authentication vulnerability

Schneider Electric · Modicon M340 Bmxp3420302 Firmware

CWE-287: Improper Authentication vulnerability exists which could cause the execution of commands on the webserver without authentication when sending specially crafted HTTP requests.

9.8 CVSS 3.1 Critical EPSS 2.3% · top 17.1% CWE-287 · Improper authentication
9.8CVSS 3.1 base score, v2 7.5
2.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
16Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

CWE-287: Improper Authentication vulnerability exists which could cause the execution of commands on the webserver without authentication when sending specially crafted HTTP requests.

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

Affected products

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

References

LinkTags
https://download.schneider-electric.com/files?p_File_Name=SEVD-2020-287-01_Modicon_Web_Server_Security_Notificatiton.pdf
https://www.se.com/ww/en/download/document/SEVD-2020-287-01/ 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-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-2020-7533), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.