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Vulnerability record · CVE-2021-22787 · published 11 February 2022

CVE-2021-22787: Schneider-electric modicon m340 bmxp342020 firmware improper input validation vulnerability

Schneider Electric · Modicon M340 Bmxp342020 Firmware

A CWE-20: Improper Input Validation vulnerability exists that could cause denial of service of the device when an attacker sends a specially crafted HTTP request to the web server of the device. Affected Product: Modicon M340 CPUs: BMXP34 (Versions prior to V3.40), Modicon M340 X80 Ethernet Communication Modules: BMXNOE0100 (H), BMXNOE0110 (H), BMXNOC0401, BMXNOR0200H RTU (All Versions), Modicon Premium Processors with integrated Ethernet (Copro): TSXP574634, TSXP575634, TSXP576634 (All Versions), Modicon Quantum Processors with Integrated Ethernet (Copro): 140CPU65xxxxx (All Versions), Modicon Quantum Communication Modules: 140NOE771x1, 140NOC78x00, 140NOC77101 (All Versions), Modicon Premium Communication Modules: TSXETY4103, TSXETY5103 (All Versions)

7.5 CVSS 3.1 High EPSS 1.0% · top 37.5% CWE-20 · Improper input validation
7.5CVSS 3.1 base score, v2 5.0
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
14Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A CWE-20: Improper Input Validation vulnerability exists that could cause denial of service of the device when an attacker sends a specially crafted HTTP request to the web server of the device. Affected Product: Modicon M340 CPUs: BMXP34 (Versions prior to V3.40), Modicon M340 X80 Ethernet Communication Modules: BMXNOE0100 (H), BMXNOE0110 (H), BMXNOC0401, BMXNOR0200H RTU (All Versions), Modicon Premium Processors with integrated Ethernet (Copro): TSXP574634, TSXP575634, TSXP576634 (All Versions), Modicon Quantum Processors with Integrated Ethernet (Copro): 140CPU65xxxxx (All Versions), Modicon Quantum Communication Modules: 140NOE771x1, 140NOC78x00, 140NOC77101 (All Versions), Modicon Premium Communication Modules: TSXETY4103, TSXETY5103 (All Versions)

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

Affected products

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

References

LinkTags
https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-257-02 PatchVendor Advisory
https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-257-02 PatchVendor Advisory

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Related vulnerabilities

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

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Source: NIST National Vulnerability Database (record CVE-2021-22787), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.