Schneider Electric Security Notification
Modicon PAC Controllers
9 August 2022 (13 August 2024)

Overview
Schneider Electric is aware of a vulnerability in its Modicon PAC Controllers.
Modicon PLCs (Programmable Logic Controllers) and PACs (Programmable Automation
Controllers) control and monitor industrial operations in a sustainable, flexible, efficient, andprotected way.
Failure to apply the remediations provided below may risk memory related errors, which could
result in Denial of Service of the controller when using Modbus TCP.
August 2024 Update: A remediation is available for the Modicon M580 CPU Safety (page 2).

Affected Products and Versions
ProductVersion

Modicon M340 CPU (part numbers BMXP34*)

V3.40 and prior

Modicon M580 CPU Safety (part numbers BMEP58*S andBMEH58*S)

Versions prior to SV4.21

Modicon M580 CPU (part numbers BMEP* and BMEH*,
excluding M580 CPU Safety)

SV3.22 and prior

Legacy Modicon Quantum/Premium

All Versions

Modicon Momentum Unity M1E processor (171CBU*)

SV2.5 and prior

Modicon MC80 (BMKC80)

V1.7 and priorVulnerability Details
CVE ID: CVE-2022-37301
CVSS v3.1 Base Score 7.5 | High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-191: Integer Underflow (Wrap or Wraparound) vulnerability exists that could cause adenial of service of the controller due to memory access violations when using the Modbus TCP
protocol.

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Remediation
Affected Products

Remediations

Modicon Modicon M340
CPU (part numbers
BMXP34*)v3.40 and prior

Firmware v3.50 includes a fix for this vulnerability and isavailable for download here:
https://www.se.com/ww/en/download/document/BMXP34xxxxx_SV_03.50/
Firmware SV4.21 includes a fix for this vulnerability and isavailable for download here:

Modicon M580 CPU
Safety (part numbers
BMEP58*S andBMEH58*S)
Versions prior to SV4.21

https://www.se.com/ww/en/product-range/62098-modiconm580-pac-controller/#software-and-firmware
Important: customer needs to use version of EcoStruxure™
Control Expert v16.0 HF001 minimum to connect with the latest
version of M580 CPU Safety. The software is available fordownload here:
https://www.se.com/ww/en/product-range/548-ecostruxurecontrol-expert-unity-pro/#software-and-firmware

Modicon M580 CPU(part numbers BMEP*
and BMEH*, excluding
M580 CPU Safety)
Versions prior to SV4.10

Firmware SV4.10 includes a fix for this vulnerability and isavailable for download here:
https://www.se.com/ww/en/download/document/BMEx58x0x0_S
V04.10/Modicon MC80
(BMKC80)v1.7 and prior

Firmware v1.8 includes a fix for this vulnerability and is available
for download here:
https://www.se.com/ww/en/product-range/62396-modiconmc80/#software-and-firmware

Modicon MOMENTUMCPU (171CBU*)
Versions prior to SV2.6

Firmware SV2.6 includes a fix for this vulnerability and isavailable for download here:
https://www.se.com/ww/en/download/document/Momentum_FW_update/Legacy Modicon
Quantum/Premium
All Versions

Schneider Electric’s Modicon Premium and Quantum controllers
have reached their end of life and are no longer commerciallyavailable. They have been replaced by the Modicon M580 ePAC
controller, our current product offer.
Customers should strongly consider migrating to the Modicon
M580 ePAC.
Please contact your local Schneider Electric technical support formore information.

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Customers should use appropriate patching methodologies when applying these patches totheir systems. We strongly recommend the use of back-ups and evaluating the impact of thesepatches in a Test and Development environment or on an offline infrastructure. Contact
Schneider Electric’s Customer Care Center if you need assistance removing a patch.
If customers choose not to apply the remediation provided above, they should immediatelyapply the mitigations provided in the table below.

Affected ProductMitigations•••Modicon
Modicon M340
CPU (partnumbersBMXP34*)
v3.40 and prior••
Modicon M580
CPU (partnumbers BMEP*and BMEH*)
v3.22 and prior•

Setup an application password in the project properties.
Setup network segmentation and implement a firewall to block all
unauthorized access to port 502/TCP.
Configure the Access Control List following therecommendations of the user manuals:o “Modicon M580, Hardware, Reference Manual”:
https://www.se.com/ww/en/download/document/EIO0000
001578/o “Modicon M340 for Ethernet Communications Modules
and Processors User Manual” in chapter “MessagingConfiguration Parameters”:
https://www.se.com/ww/en/download/document/31007131K
01000/o “Momentum for EcoStruxure™ Control Expert - 171 CBU
78090, 171 CBU 98090, 171 CBU 98091 Processors”
manual in the chapter “Modbus Messaging and AccessControl”: https://download.schneiderelectric.com/files?p_enDocType=User+guide&p_File_Na
me=HRB44124.08.pdf&p_Doc_Ref=HRB44124
Setup a secure communication according to the following
guideline “Modicon Controllers Platform Cyber Security
Reference Manual,” in chapter “Setup secured communications”:
https://www.se.com/ww/en/download/document/EIO0000001999/
Use a BMENOC module and follow the instructions to configure
IPSEC feature as described in the guideline “Modicon M580 BMENOC03.1 Ethernet Communications Schneider Electric
Security Notification Module, Installation and Configuration
Guide” in the chapter “Configuring IPSEC communications”:
https://www.se.com/ww/en/download/document/HRB62665/
Ensure the M580 CPU is running with the memory protection
activated by configuring the input bit to a physical input, for moredetails refer to the following guideline “Modicon Controllers
Platform Cyber Security Reference Manual”, “CPU Memory
Protection section”: https://www.schneiderelectric.com/en/download/document/EIO0000001999/9-Aug-22 (13-Aug-24) Document Reference Number – SEVD-2022-221-02 v5.0.0

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NOTE: The CPU memory protection cannot beconfigured with Hot Standby CPUs. In such cases, use
IPsec encrypted communication
Setup a VPN between the Modicon PLC controllers and theengineering workstation containing EcoStruxure Control Expert
or Process Expert. Note: this functionality may be provided by an
external IPSEC compatible firewall located close to thecontroller.
o•Modicon M580
CPU Safety (partnumbers
BMEP58*S andBMEH58*S)
Versions prior toSV4.21

To further reduce the attack surface on Modicon M580 CPU Safety:• Ensure the CPU is running in Safety mode and maintenanceinput is configured to maintain this Safety mode during operation– refer to the document Modicon M580 - Safety System Planning
Guide - in the chapter “Operating Mode Transitions”:
https://www.se.com/ww/en/download/document/QGH60283/
To ensure you are informed of all updates, including details on affected
products and remediation plans, subscribe to Schneider Electric’s
security notification service here:
https://www.se.com/en/work/support/cybersecurity/securitynotifications.jsp

ModiconMOMENTUM CPU(171CBU*)
SV2.5 and prior

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Legacy Modicon
Quantum/Premium
All versions

If customers choose not to upgrade, they should immediately apply thefollowing mitigations to reduce the risk of exploit:• Setup network segmentation and implement a firewall to block all
unauthorized access to port 502/TCP• Configure the Access Control List feature as mentioned in“Quantum using EcoStruxure™ Control Expert - TCP/IP
Configuration, User Manual” in chapter “Software Settings for
Ethernet Communication / Messaging / Quantum NOE Ethernet
Messaging Configuration”:
https://www.se.com/ww/en/download/document/33002467K01000/• Configure the Access Control List following the recommendationsof the user manual “Premium and Atrium using EcoStruxure™
Control Expert - Ethernet Network Modules, User Manual” inchapters “Connection configuration parameters / TCP/IP Services
Configuration Parameters / Connection Configuration Parameters”:
https://www.se.com/ww/en/download/document/35006192K01000/

To ensure you are informed of all updates, including details on affected products andremediation plans, subscribe to Schneider Electric’s security notification service here:
https://www.se.com/en/work/support/cybersecurity/security-notifications.jsp

General Security Recommendations
We strongly recommend the following industry cybersecurity best practices.
•••
•••••

Locate control and safety system networks and remote devices behind firewalls andisolate them from the business network.
Install physical controls so no unauthorized personnel can access your industrial control
and safety systems, components, peripheral equipment, and networks.
Place all controllers in locked cabinets and never leave them in the “Program” mode.
Never connect programming software to any network other than the network intended forthat device.
Scan all methods of mobile data exchange with the isolated network such as CDs, USBdrives, etc. before use in the terminals or any node connected to these networks.
Never allow mobile devices that have connected to any other network besides theintended network to connect to the safety or control networks without proper sanitation.
Minimize network exposure for all control system devices and systems and ensure thatthey are not accessible from the Internet.
When remote access is required, use secure methods, such as Virtual Private Networks(VPNs). Recognize that VPNs may have vulnerabilities and should be updated to themost current version available. Also, understand that VPNs are only as secure as theconnected devices.

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For more information refer to the Schneider Electric Recommended Cybersecurity BestPractices document.

Acknowledgements
Schneider Electric recognizes the following researcher for identifying and helping to coordinate
a response to this vulnerability:
CVE

Researcher

CVE-2022-37301

Li WEI, BooleanTech

For More Information
This document provides an overview of the identified vulnerability or vulnerabilities and actions
required to mitigate. For more details and assistance on how to protect your installation, contact
your local Schneider Electric representative or Schneider Electric Industrial Cybersecurity
Services: https://www.se.com/ww/en/work/solutions/cybersecurity/. These organizations will befully aware of this situation and can support you through the process.
For further information related to cybersecurity in Schneider Electric’s products, visit thecompany’s cybersecurity support portal page:https://www.se.com/ww/en/work/support/cybersecurity/overview.jsp
LEGAL DISCLAIMER
THIS NOTIFICATION DOCUMENT, THE INFORMATION CONTAINED HEREIN, AND ANY MATERIALSLINKED FROM IT (COLLECTIVELY, THIS “NOTIFICATION”) ARE INTENDED TO HELP PROVIDE ANOVERVIEW OF THE IDENTIFIED SITUATION AND SUGGESTED MITIGATION ACTIONS,REMEDIATION, FIX, AND/OR GENERAL SECURITY RECOMMENDATIONS AND IS PROVIDED ON AN“AS-IS” BASIS WITHOUT WARRANTY OR GUARANTEE OF ANY KIND. SCHNEIDER ELECTRICDISCLAIMS ALL WARRANTIES RELATING TO THIS NOTIFICATION, EITHER EXPRESS OR IMPLIED,INCLUDING WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
SCHNEIDER ELECTRIC MAKES NO WARRANTY THAT THE NOTIFICATION WILL RESOLVE THEIDENTIFIED SITUATION. IN NO EVENT SHALL SCHNEIDER ELECTRIC BE LIABLE FOR ANYDAMAGES OR LOSSES WHATSOEVER IN CONNECTION WITH THIS NOTIFICATION, INCLUDINGDIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIALDAMAGES, EVEN IF SCHNEIDER ELECTRIC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCHDAMAGES. YOUR USE OF THIS NOTIFICATION IS AT YOUR OWN RISK, AND YOU ARE SOLELYLIABLE FOR ANY DAMAGES TO YOUR SYSTEMS OR ASSETS OR OTHER LOSSES THAT MAYRESULT FROM YOUR USE OF THIS NOTIFICATION. SCHNEIDER ELECTRIC RESERVES THE RIGHTTO UPDATE OR CHANGE THIS NOTIFICATION AT ANY TIME AND IN ITS SOLE DISCRETION

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About Schneider Electric
Schneider’s purpose is to empower all to make the most of our energy and resources, bridging progress andsustainability for all. We call this Life Is On.
Our mission is to be your digital partner for Sustainability and Efficiency.
We drive digital transformation by integrating world-leading process and energy technologies, end-point to cloudconnecting products, controls, software and services, across the entire lifecycle, enabling integrated company
management, for homes, buildings, data centers, infrastructure and industries.
We are the most local of global companies. We are advocates of open standards and partnership ecosystems thatare passionate about our shared Meaningful Purpose, Inclusive and Empowered values.
www.se.com

Revision Control:
Version 1.0.0
09 August 2022

Original Release

Version 2.0.0
13 September 2022

A fix is available for Modicon MC80 (BMKC80)
controller.

Version 3.0.0
13 December 2022

The Modicon M580 SV4.02 firmware has been
retracted for quality issues and is no longer
available for download. Additional mitigations havebeen introduced for Modicon M580 CPU andM580 CPU Safety, and we urge customers todeploy these mitigations to further reduce the riskof potential exploitation of identified vulnerabilities.

Version 4.0.0
14 March 2023

A remediation is available for Modicon Momentum
Unity M1E processor and for the Modicon M580
CPU.

Version 5.0.0
13 August 2024

A remediation is available for the Modicon M580
CPU Safety (page 2).

CPCERT

Digitally signed by CPCERT
Date: 2024.08.12 12:31:14 -04'00'

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