Schneider Electric Security Notification
Web Server on Modicon M340, Legacy Offers Modicon Quantum andPremium and Associated Communication Modules
14 September 2021 (14 February 2023)

Overview
Schneider Electric is aware of multiple vulnerabilities in the web server component of theModicon M340 PLC. In addition, the Modicon Quantum and Modicon Premium Legacy offers,
and associated communication modules are affected.
The Modicon Ethernet Programmable Automation products are controllers for industrial process
and infrastructure.
Failure to apply the remediations provided below may risk an attack via the web server, which
could result in disclosure of sensitive information or denial of service of the controller.
February 2023 Update: A remediation is available for Modicon M340 Ethernet Communication
Modules BMXNOE0100 (H) and BMXNOE0110 (H) (page 4).

Affected Products and Versions
ProductVersion

Modicon M340 CPUsBMXP34* versions Prior to V3.40

Modicon Ethernet
Communication Modules
Modicon Premium processors
with integrated Ethernet
COPRO
Modicon Quantum processors
with integrated Ethernet
COPRO

BMXNOE0100 (H) versions Prior to SV03.50
BMXNOE0110 (H) versions Prior to SV06.70
BMXNOC0401 versions Prior to V2.11
BMXNOR0200H RTU versions Prior to V1.7 IR24
TSXP574634 All versions
TSXP575634 All versions
TSXP576634 All versions
140CPU65xxxxx All versions

Modicon Quantum
communication Modules

140NOE771x1 All versions
140NOC78x00 All versions
140NOC77101 All versions

Modicon Premium
communication Modules

TSXETY4103 All versions
TSXETY5103 All versions

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Schneider Electric Security Notification
Vulnerability Details
CVE ID: CVE-2021-22785
CVSS v3.1 Base Score 7.5 | High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
A CWE-200: Information Exposure vulnerability exists that could cause sensitive information offiles located in the web root directory to leak when an attacker sends a HTTP request to the webserver of the device.
CVE ID: CVE-2021-22788
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
A CWE-787: Out-of-bounds Write vulnerability exists that could cause denial of service when anattacker sends a specially crafted HTTP request to the web server of the device.
CVE ID: CVE-2021-22787
CVSS v3.1 Base Score 7.5 | High | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
A CWE-20: Improper Input Validation vulnerability exists that could cause denial of service ofthe device when an attacker sends a specially crafted HTTP request to the web server of thedevice.

Remediation & Mitigation
Schneider Electric encourages all industrial companies to ensure they have implemented
cybersecurity best practices across their operations and supply chains to reduce cyber risks.
Where appropriate this includes locating industrial systems and remotely accessible devices
behind firewalls; installing physical controls to prevent unauthorized access; preventing mission
critical systems and devices from being accessed from outside networks; systematically
applying security patches. In addition, specific recommended actions on the impacted products
are listed below.
Affected Product &Version

Remediation/Mitigation

Modicon M340 CPU
BMXP34*
Prior to V3.40

V3.40 includes a fix for these vulnerabilities and is available fordownload here:
https://www.se.com/ww/en/download/document/BMXP34xxxxx_S
V_xx.xx/8-Dec-20 (14-Feb-23)

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Schneider Electric Security Notification
V1.70 IR24 includes a fix for these vulnerabilities and is available
for download here:
https://www.se.com/ww/en/download/document/BMXNOR0200H_FW/
Note: V1.70 IR23 previously included a fix for CVE-2021-22785
If customers choose not to apply the recommended fixes, thenthey should apply the mitigations below to reduce the risk of theexploit:• Setup network segmentation and implement a firewall toblock all unauthorized access to port 80/HTTP (Note HTTP
is disabled by default).
• Configure the Access Control List following therecommendations of the user manual “Modicon M340 for
Ethernet Communications Modules and Processors UserManual” in chapter “Messaging Configuration
Parameters”: https://www.se.com/ww/en/download/documen
t/31007131K01000/• Setup a VPN between the Modicon PLC impacted modules
and the engineering workstation containing EcoStruxureControl Expert or Process Expert.

Modicon M340 X80
EthernetCommunication
Modules
BMXNOR0200H RTU
Prior to V1.70 IR24

Version SV03.50 of BMXNOE0100 (H) includes a fix for thesevulnerabilities and is available for download here:
https://www.se.com/ww/en/download/document/BMXNOE0100_S
V_03.50/

Modicon M340 Ethernet
Communication
Modules
BMXNOE0100 (H)Versions Prior toSV03.50
BMXNOE0110 (H)Versions Prior to
SV06.708-Dec-20 (14-Feb-23)

Version SV06.70 of BMXNOE0110 (H) includes a fix for thesevulnerabilities and is available for download here:
https://www.se.com/ww/en/download/document/BMXNOE0110_S
V_06.70/
If customers choose not to apply the remediation, then theyshould immediately apply the following mitigations to reduce therisk of exploit:• Setup network segmentation and implement a firewall toblock all unauthorized access to port 80/HTTP (Note HTTP
is disabled by default).
• Configure the Access Control List following therecommendations of the user manual “Modicon M340 for
Ethernet Communications Modules and Processors User
Manual” in chapter “Messaging Configuration
Parameters”: https://www.se.com/ww/en/download/documen
t/31007131K01000/• Setup a VPN between the Modicon PLC impacted modules
and the engineering workstation containing EcoStruxureControl Expert or Process Expert.

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Schneider Electric Security Notification

Modicon M340 Ethernet
TCP/IP Network Module
BMXNOC0401
Prior to V2.11

Modicon Quantum
Processors withIntegrated Ethernet
COPRO
140CPU65xxxxx
All versions
Modicon Quantum
Communication
Modules:140NOC78x00
All versions
140NOC77101
All versions
140NOE771x1
All versions

BMXNOC0401 V2.11 is available for download that has a fix ofthe reported vulnerabilities:
https://www.se.com/ww/en/product/BMXNOC0401/ethernet-tcpip-network-module-modicon-m340-automation-platform-4-x-rj4510-100/If customers choose not to apply the fix, then, they should
immediately apply the following mitigations to reduce the risk ofexploit:• Setup network segmentation and implement a firewall toblock all unauthorized access to port 80/HTTP• Setup a VPN between the Modicon PLC impacted modules
and the engineering workstation containing EcoStruxureControl Expert or Process Expert.
Modicon Quantum and Associated Communication Modules:
Schneider Electric’s Modicon Quantum controllers have reached theirend of life and are no longer commercially available. They have been
replaced by the Modicon M580 ePAC controller, our most current
product offer. Customers should strongly consider migrating to theModicon M580 ePAC. Please contact your local Schneider Electric
technical support for more information.
To mitigate the risks, users should immediately:• Disable the Web server using 'Web Access (HTTP)' via
UnityPro / EcoStruxure Control Expert using the following
guideline “ Quantum using EcoStruxure™ Control Expert TCP/IP Configuration, User Manual” in the chapter “Security(Enable / Disable HTTP, FTP, and TFTP)”:https://www.se.com/ww/en/download/document/33002479K01000

Modicon Premium
processors withintegrated Ethernet
COPRO:
TSXP574634
All versions
TSXP575634
All versions
TSXP576634
All versions

Modicon Premium and Associated Communication Modules:
Schneider Electric’s Modicon Premium controllers have reached theirend of life and are no longer commercially available. They have been
replaced by the Modicon M580 ePAC controller, our most current
product offer. Customers should strongly consider migrating to theModicon M580 ePAC. Please contact your local Schneider Electric
technical support for more information.
To mitigate the risks, users should immediately:• Disable the Web server using 'Web Access (HTTP)' via
UnityPro / EcoStruxure Control Expert using the following
guideline “Premium and Atrium using EcoStruxure™ Control
Expert - Ethernet Network Modules, User Manual” in the

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Schneider Electric Security Notification
Modicon PremiumCommunication
Modules:
TSXETY4103
All versions
TSXETY5103
All versions

chapter “Security Service Configuration Parameters /Security (Enable / Disable HTTP, FTP, and TFTP)”:https://www.se.com/ww/en/download/document/35006192
K01000For further information, please check the “Premium and Atrium using
EcoStruxure™ Control Expert - Ethernet Network Modules, User
Manual” and the Modicon Controllers Platform Cyber Security
Reference ManualGeneral 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 for thedevices that it is intended for.
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.

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

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Schneider Electric Security Notification
Acknowledgements
Schneider Electric recognizes the following researchers for identifying and helping to coordinate
a response to these vulnerabilities:
CVEResearchers

CVE-2021-22785
CVE-2021-22788

Peter Cheng from ELEX FEIGONG RESEARCH INSTITUTE

CVE-2021-22787

BDU FSTEC Russia

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.
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 MAY
RESULT FROM YOUR USE OF THIS NOTIFICATION. SCHNEIDER ELECTRIC RESERVES THE RIGHTTO UPDATE OR CHANGE THIS NOTIFICATION AT ANY TIME AND IN ITS SOLE DISCRETIONAbout Schneider ElectricSchneider’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.

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Schneider Electric Security Notification
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
14 September 2021

Original Release

Version 2.0
13 September 2022

A remediation is available for Modicon M340 X80
Ethernet Communication Modules
BMXNOR0200H RTU (page 3) and BMXNOC0401(page 4).

Version 3.0
14 February 2023

A remediation is available for Modicon M340
Ethernet Communication Modules BMXNOE0100(H) and BMXNOE0110 (H) (page 4).

Product Security Office

8-Dec-20 (14-Feb-23)

Digitally signed by Product Security
OfficeDate: 2023.02.13 12:59:38 -05'00'

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