What is CVE-2021-22789?

CVE-2021-22789 is a vulnerability that allows an attacker to cause a denial of service on the Modicon PLC controller / simulator.

What is the severity of CVE-2021-22789?

The severity of CVE-2021-22789 is medium, with a CVSS score of 6.5.

Which software is affected by CVE-2021-22789?

Schneider-electric Modicon M340 and Modicon M580 CPUs, as well as certain models of the Modicon Momentum, Premium, Quantum, and PLC Simulator for Ecostruxure Control Expert and Ecostruxure Process Expert, are affected by CVE-2021-22789.

How can I fix CVE-2021-22789?

To fix CVE-2021-22789, it is recommended to update the controller application with the latest version provided by Schneider Electric.

Where can I find more information about CVE-2021-22789?

You can find more information about CVE-2021-22789 at the following link: [Schneider Electric Security Advisory SEVD-2021-222-04](https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-222-04)

Vulnerability/
CVE-2021-22789

medium

6.5

CWE

119

2/9/2021

3/8/2024

CVE-2021-22789: Buffer Overflow

First published: Thu Sep 02 2021(Updated: )

A CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability that could cause a Denial of Service on the Modicon PLC controller / simulator when updating the controller application with a specially crafted project file exists in Modicon M580 CPU (part numbers BMEP* and BMEH*, all versions), Modicon M340 CPU (part numbers BMXP34*, all versions), Modicon MC80 (part numbers BMKC80*, all versions), Modicon Momentum Ethernet CPU (part numbers 171CBU*, all versions), PLC Simulator for EcoStruxureª Control Expert, including all Unity Pro versions (former name of EcoStruxureª Control Expert, all versions), PLC Simulator for EcoStruxureª Process Expert including all HDCS versions (former name of EcoStruxureª Process Expert, all versions), Modicon Quantum CPU (part numbers 140CPU*, all versions), Modicon Premium CPU (part numbers TSXP5*, all versions).

Credit: cybersecurity@se.com

Affected Software	Affected Version	How to fix
Schneider-electric Modicon M340 Bmxp341000
Schneider-electric Modicon M340 Bmxp342010
Schneider-electric Modicon M340 Bmxp342020
Schneider-electric Modicon M340 Bmxp342030
Schneider-electric Modicon M580 Bmeh582040
Schneider-electric Modicon M580 Bmeh582040c
Schneider-electric Modicon M580 Bmeh582040s
Schneider-electric Modicon M580 Bmeh584040
Schneider-electric Modicon M580 Bmeh584040c
Schneider-electric Modicon M580 Bmeh584040s
Schneider-electric Modicon M580 Bmeh586040
Schneider-electric Modicon M580 Bmeh586040c
Schneider-electric Modicon M580 Bmeh586040s
Schneider-electric Modicon M580 Bmep581020
Schneider-electric Modicon M580 Bmep581020h
Schneider-electric Modicon M580 Bmep582020
Schneider-electric Modicon M580 Bmep582020h
Schneider-electric Modicon M580 Bmep582040
Schneider-electric Modicon M580 Bmep582040h
Schneider-electric Modicon M580 Bmep582040s
Schneider-electric Modicon M580 Bmep583020
Schneider-electric Modicon M580 Bmep583040
Schneider-electric Modicon M580 Bmep584020
Schneider-electric Modicon M580 Bmep584040
Schneider-electric Modicon M580 Bmep584040s
Schneider-electric Modicon M580 Bmep585040
Schneider-electric Modicon M580 Bmep585040c
Schneider-electric Modicon M580 Bmep586040
Schneider-electric Modicon M580 Bmep586040c
Schneider-electric Modicon Mc80 Bmkc8020301
Schneider-electric Modicon Mc80 Bmkc8020310
Schneider-electric Modicon Mc80 Bmkc8030311
Schneider-electric Modicon Momentum 171cbu78090
Schneider-electric Modicon Momentum 171cbu98090
Schneider-electric Modicon Momentum 171cbu98091
Schneider-electric Modicon Premium Tsxp57 1634m
Schneider-electric Modicon Premium Tsxp57 2634m
Schneider-electric Modicon Premium Tsxp57 2834m
Schneider-electric Modicon Premium Tsxp57 454m
Schneider-electric Modicon Premium Tsxp57 4634m
Schneider-electric Modicon Premium Tsxp57 554m
Schneider-electric Modicon Premium Tsxp57 5634m
Schneider-electric Modicon Premium Tsxp57 6634m
Schneider-electric Modicon Quantum 140cpu65150
Schneider-electric Modicon Quantum 140cpu65150c
Schneider-electric Modicon Quantum 140cpu65160
Schneider-electric Modicon Quantum 140cpu65160c
Schneider-electric Plc Simulator For Ecostruxure Control Expert
Schneider-electric Plc Simulator For Ecostruxure Process Expert

Remedy

https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-222-04

Never miss a vulnerability like this again

Reference Links

https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-222-04

Frequently Asked Questions

What is CVE-2021-22789?
CVE-2021-22789 is a vulnerability that allows an attacker to cause a denial of service on the Modicon PLC controller / simulator.
What is the severity of CVE-2021-22789?
The severity of CVE-2021-22789 is medium, with a CVSS score of 6.5.
Which software is affected by CVE-2021-22789?
Schneider-electric Modicon M340 and Modicon M580 CPUs, as well as certain models of the Modicon Momentum, Premium, Quantum, and PLC Simulator for Ecostruxure Control Expert and Ecostruxure Process Expert, are affected by CVE-2021-22789.
How can I fix CVE-2021-22789?
To fix CVE-2021-22789, it is recommended to update the controller application with the latest version provided by Schneider Electric.
Where can I find more information about CVE-2021-22789?
You can find more information about CVE-2021-22789 at the following link: [Schneider Electric Security Advisory SEVD-2021-222-04](https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-222-04)