Schneider Electric Security Notification
Modicon PLCs (Programmable Logic Controllers) and PACs
(Programmable Automation Controllers)
11 April 2023 (13 August 2024)

Overview
Schneider Electric is aware of multiple vulnerabilities in its Modicon PLCs (Programmable LogicControllers) and PACs (Programmable Automation Controllers).
Modicon PLCs (Programmable Logic Controllers) and PACs (Programmable AutomationControllers) control and monitor industrial operations in a sustainable, flexible, efficient, andprotected way.
Failure to apply the remediations and mitigations provided below may risk a denial of service ofthe controller, which could result in disrupted operations.
August 2024 Update: A remediation is available for Modicon M580 CPU Safety (page 2).

Affected Products and Versions
ProductModicon M340 CPU (part numbers BMXP34*)
Versions prior to SV3.51
Modicon M580 CPU (part numbers BMEP* andBMEH*)
Versions prior to v4.10
Modicon M580 CPU Safety (part numbersBMEP58*S and BMEH58*S)
Versions prior to SV4.21
Modicon Momentum Unity M1E Processor(171CBU*)
All versions prior to SV2.70
Modicon MC80 (BMKC80)
Versions prior to SV2.0
Legacy Modicon Quantum (140CPU65*)
All versions
Legacy Modicon
Premium CPUs (TSXP57*)
All versions

CVE-202325619

CVE-202325620

xxxxxxxxxxxxx

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Schneider Electric Security Notification
Vulnerability Details
CVE ID: CVE-2023-25619
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-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists that could
cause denial of service of the controller when communicating over the Modbus TCP protocol.
CVE ID: CVE-2023-25620
CVSS v3.1 Base Score 6.5 | Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists that could
cause denial of service of the controller when a malicious project file is loaded onto thecontroller by an authenticated user.
Note regarding vulnerability details: The severity of vulnerabilities was calculated using theCVSS Base metrics in version 3.1 (CVSS v3.1) without incorporating the Temporal andEnvironmental metrics. Schneider Electric recommends that customers score the CVSS
Environmental metrics, which are specific to end-user organizations, and consider factors suchas the presence of mitigations in that environment. Environmental metrics may refine therelative severity posed by the vulnerabilities described in this document within a customer’senvironment.

Remediation
Affected Product &Version
Modicon M340 CPU(part numbersBMXP34*)
Versions prior to SV3.51
Modicon M580
(part numbers BMEP*and BMEH*, excluding
M580 CPU Safety)
Versions prior to SV4.10

Modicon M580 CPUSafety (BMEP58*S andBMEH58*S)
Versions prior to SV4.21

Remediation
Firmware SV3.51 includes a fix for these vulnerabilities and isavailable for download here:
https://www.se.com/ww/en/product-range/1468-modiconm340/#software-and-firmware

Firmware SV4.10 includes a fix for these vulnerabilities and isavailable for download here:
https://www.se.com/ww/en/download/document/BMEx58x0x0_SV
04.10/
Firmware SV4.21 includes a fix for these vulnerabilities and isavailable for download here:
https://www.se.com/ww/en/product-range/62098-modicon-m580epac-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:

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Schneider Electric Security Notification
https://www.se.com/ww/en/product-range/548-ecostruxurecontrol-expert-unity-pro/#software-and-firmware
Modicon Momentum
Unity M1E Processor(171CBU*)
Versions prior to SV2.70

Firmware SV2.70 includes a fix for these vulnerabilities and isavailable for download here: https://www.se.com/ww/en/productrange/535-modicon-momentum/ - software-and-firmware

Modicon MC80(BMKC80)
Versions prior to SV2.0

Firmware SV2.0 includes a fix for these vulnerabilities and isavailable for download here:
https://www.se.com/ww/en/download/document/BMKC80_Firmwa
re_upgrade/

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 immediately
apply the following mitigations to reduce the risk of exploit:

Mitigations••

Setup an application password in the project properties.
Setup network segmentation and implement a firewall to block all unauthorized accessto port 502/TCP.

For Modicon Controllers, when loading a project file through EcoStruxure™ Control Expert,
ensure the following:• Enable the file encryption feature for all new projects.
• Encrypt project files when stored and restrict the access to only trusted users.
• When exchanging files over the network, use secure communication protocols.
• Only open project files received from trusted source, and it is recommended to shareproject files only when configured with the encryption feature.
In addition, the following specific mitigations apply:Affected Product &Version
Modicon M340 CPU(part numbers
BMXP34*)All versions

Mitigations•Configure the Access Control List following therecommendations of the user manuals “Modicon M340 for
Ethernet Communications Modules and Processors UserManual” in chapter “Messaging Configuration Parameters”:

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Schneider Electric Security Notification•••••

Modicon M580 CPU(part numbers BMEP*and BMEH*)
Versions prior toSV4.10•

https://www.se.com/ww/en/download/document/31007131K010
00/
Setup a secure communication according to the following
guideline “Modicon Controllers Platform Cyber Security
Reference Manual,” in chapter “Setup securedcommunications”:
https://www.se.com/ww/en/download/document/EIO000000199
9/Consider use of external firewall devices such as EAGLE40-07
from Belden to establish VPN connections for M340 & M580
architectures. For more details refer to the chapter “How toprotect M580 and M340 architectures with EAGLE40 using
VPN”:
https://www.se.com/ww/en/download/document/EIO000000199
9/
Ensure the M340 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/
Configure the Access Control List following therecommendations of the user manuals: “Modicon M580,Hardware, Reference Manual”:
https://www.se.com/ww/en/download/document/EIO000000157
8/
Setup a secure communication according to the following
guideline “Modicon Controllers Platform Cyber Security
Reference Manual,” in chapter “Setup securedcommunications”:
https://www.se.com/ww/en/download/document/EIO000000199
9/• use a BMENOC module and follow the instructions toconfigure IPSEC feature as described in the guideline“Modicon M580 - BMENOC03.1 Ethernet
Communications Schneider Electric Security Notification
Module, Installation and Configuration Guide” in thechapter “Configuring IPSEC communications”:
https://www.se.com/ww/en/download/document/HRB626
65/
OR
Use a BMENUA0100 module and follow the instructions toconfigure IPSEC feature as described in the chapter“Configuring the BMENUA0100 Cybersecurity Settings”:
https://www.se.com/ww/en/download/document/PHA83350

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Schneider Electric Security Notification••••Modicon M580 CPUSafety (BMEP58*Sand BMEH58*S)
Versions prior toSV4.21•ORConsider use of external firewall devices such as EAGLE40-07
from Belden to establish VPN connections for M340 & M580
architectures. For more details refer to the chapter “How toprotect M580 and M340 architectures with EAGLE40 using
VPN”:
https://www.se.com/ww/en/download/document/EIO000000199
9/
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/• NOTE: The CPU memory protection cannot be
configured with M580 Hot Standby CPUs. In suchcases, use IPsec encrypted communication.
Configure the Access Control List following therecommendations of the user manuals: “Modicon M580,Hardware, Reference Manual”
https://www.se.com/ww/en/download/document/EIO000000157
8/
Setup a secure communication according to the following
guideline “Modicon Controllers Platform Cyber Security
Reference Manual,” in chapter “Setup securedcommunications”:
https://www.se.com/ww/en/download/document/EIO000000199
9/• use a BMENOC module and follow the instructions toconfigure IPSEC feature as described in the guideline“Modicon M580 - BMENOC03.1 Ethernet
Communications Schneider Electric Security Notification
Module, Installation and Configuration Guide” in thechapter “Configuring IPSEC communications”:
https://www.se.com/ww/en/download/document/HRB626
65/
ORUse a BMENUA0100 module and follow the instructions toconfigure IPSEC feature as described in the chapter“Configuring the BMENUA0100 Cybersecurity Settings”:https://www.se.com/ww/en/download/document/PHA83350
OR11-Apr-23 (13-Aug-24) Document Reference Number – SEVD-2023-101-05 (v4.0.0) Page 5 of 9

Schneider Electric Security Notification••

Modicon MOMENTUM
Unity M1E
Processor(171CBU*)
All versions

Consider use of external firewall devices such as EAGLE40-07
from Belden to establish VPN connections for M340 & M580
architectures. For more details refer to the chapter “How toprotect M580 and M340 architectures with EAGLE40 usingVPN”:
https://www.se.com/ww/en/download/document/EIO000000199
9/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/• NOTE: The CPU memory protection cannot be
configured with M580 Hot Standby CPUs. In suchcases, use IPsec encrypted communication.

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/
Schneider Electric is establishing a remediation plan for all futureversions of Momentum Unity M1E Processors that will include a fix forthese vulnerabilities. We will update this document when theremediation is available. Until then, customers should immediately apply
the following mitigations to reduce the risk of exploit:• Configure the Access Control List following therecommendations of the user manuals:• “Momentum for EcoStruxure™ Control Expert – 171
CBU 78090, 171 CBU 98090, 171 CBU 98091
Processors” manual in the chapter “Modbus Messagingand Access Control”:
https://www.se.com/ww/en/download/document/HRB441
24/• Setup a secure communication according to thefollowing guideline “Modicon Controllers Platform Cyber
Security Reference Manual,” in chapter “Setup securedcommunications”:
https://www.se.com/ww/en/download/document/EIO000
0001999/

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Schneider Electric Security Notification•Modicon MC80(BMKC80)
All versions•Configure the Access Control List following therecommendations of the user manuals:• “Modicon MC80 Programmable Logic Controller (PLC)
manual” in the chapter “Access Control List (ACL)”:https://www.se.com/ww/en/download/document/EIO0000002071/
Setup a secure communication according to the following
guideline “Modicon Controllers Platform Cyber Security
Reference Manual,” in chapter “Setup securedcommunications”:
https://www.se.com/ww/en/download/document/EIO000000199
9/

Schneider Electric’s Modicon Premium & Quantum controllers havereached their end of life and are no longer commercially available. They
have been replaced by the Modicon M580 ePAC controller, our mostcurrent product offer.

Modicon Premium
CPU (TSXP5*) &Quantum CPU(140CPU65*),
All versions

Customers should strongly consider migrating to the Modicon M580
ePAC. Please contact your local Schneider Electric technical support for
more information.
To mitigate the risks users should immediately:• Configure the Access Control List following therecommendations of the user manual “Premium and Atriumusing EcoStruxure™ Control Expert – Ethernet Network
Modules, User Manual” in chapters “Connection configuration
parameters / TCP/IP Services Configuration Parameters /Connection Configuration Parameters”:
https://www.se.com/ww/en/download/document/35006192K010
00/

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 controland 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.

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Schneider Electric Security Notification••••

Scan all methods of mobile data exchange with the isolated network such as CDs, USB
drives, 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.

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 these vulnerabilities:
CVE

Researcher

CVE-2023-25619
CVE-2023-25620

Sun Yue, Chinese Academy of Sciences

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 AN
OVERVIEW 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.

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Schneider Electric Security Notification
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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Our mission is to be your digital partner for Sustainability and Efficiency.
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Revision Control:
Version 1.0.0
11 April 2023

Original Release

Version 2.0.0
12 March 2024

A remediation is available for Modicon MC80.

Version 3.0.0
13 August 2024

A remediation is now available on Modicon
Momentum Unity M1E Processor.

Version 4.0.0
13 August 2024

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

CPCERT

Digitally signed by CPCERT
Date: 2024.08.12 12:20:01 -04'00'

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