← Vulnerability feed

Vulnerability record · CVE-2021-22779 · published 14 July 2021

CVE-2021-22779: Schneider-electric ecostruxure control expert authentication bypass by spoofing vulnerability

Schneider Electric · Ecostruxure Control Expert

Authentication Bypass by Spoofing vulnerability exists in EcoStruxure Control Expert (all versions prior to V15.0 SP1, including all versions of Unity Pro), EcoStruxure Control Expert V15.0 SP1, EcoStruxure Process Expert (all versions, including all versions of EcoStruxure Hybrid DCS), SCADAPack RemoteConnect for x70 (all versions), Modicon M580 CPU (all versions - part numbers BMEP* and BMEH*), Modicon M340 CPU (all versions - part numbers BMXP34*), that could cause unauthorized access in read and write mode to the controller by spoofing the Modbus communication between the engineering software and the controller.

9.1 CVSS 3.1 Critical EPSS 1.0% · top 37.9% CWE-290 · Authentication bypass by spoofing
9.1CVSS 3.1 base score, v2 6.4
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
32Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Authentication Bypass by Spoofing vulnerability exists in EcoStruxure Control Expert (all versions prior to V15.0 SP1, including all versions of Unity Pro), EcoStruxure Control Expert V15.0 SP1, EcoStruxure Process Expert (all versions, including all versions of EcoStruxure Hybrid DCS), SCADAPack RemoteConnect for x70 (all versions), Modicon M580 CPU (all versions - part numbers BMEP* and BMEH*), Modicon M340 CPU (all versions - part numbers BMXP34*), that could cause unauthorized access in read and write mode to the controller by spoofing the Modbus communication between the engineering software and the controller.

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

Affected products

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

References

LinkTags
http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-01 Vendor Advisory
http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-01 Vendor Advisory

Track CVE-2021-22779 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

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

10.0CVE-2014-0754Schneider-electric stbnic2212 firmware path traversal vulnerabilityDirectory traversal vulnerability in SchneiderWEB on Schneider Electric Modicon PLC Ethernet modules 140CPU65x Exec before 5.5, 140NOC78x Exec before…EPSS 9.0%9.8CVE-2022-45789Schneider-electric ecostruxure control expert authentication bypass by capture-replay vulnerabilityA CWE-294: Authentication Bypass by Capture-replay vulnerability exists that could cause execution of unauthorized Modbus functions on the controller…EPSS 1.5%9.8CVE-2022-45788Schneider-electric ecostruxure control expert vulnerabilityA CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists that could cause arbitrary code execution, denial of service and…EPSS 1.2%9.8CVE-2022-37300Schneider-electric ecostruxure control expert weak password recovery vulnerabilityA CWE-640: Weak Password Recovery Mechanism for Forgotten Password vulnerability exists that could cause unauthorized access in read and write mode t…EPSS 0.75%9.8CVE-2022-26507Att xmill out-of-bounds write vulnerabilityA heap-based buffer overflow exists in XML Decompression DecodeTreeBlock in AT&T Labs Xmill 0.7. A crafted input file can lead to remote code executi…EPSS 2.4%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-2020-28212Schneider-electric ecostruxure control expert improper restriction of authentication attempts vulnerabilityA CWE-307: Improper Restriction of Excessive Authentication Attempts vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (now Unity …EPSS 2.8%

Source: NIST National Vulnerability Database (record CVE-2021-22779), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.