Schneider Electric Security Notification
SNMP Service on Modicon M340 and
Associated Communication Modules
8 December 2020 (13 September 2022)

Overview
Schneider Electric is aware of a vulnerability in the Modicon M340 offer and associatedcommunication modules.
Modicon M340 Programable Automation Controllers are used in industrial processes andinfrastructure control.
Failure to apply the remediations provided below may risk unexpected modification of network
parameters, which could result in making targeted devices unreachable.
September 2022 update: A remediation is available for Modicon M340 X80 Ethernet
Communication module BMXNOC0401 (page 2).

Affected Products and Versions
ProductVersion

Modicon M340 CPUsBMXP34* versions prior to V3.30

Modicon M340 X80
Communication Ethernet
modules

BMXNOE0100 (H) versions prior to V3.4
BMXNOE0110 (H) versions prior to V6.6
BMXNOR0200H versions prior to V1.7 IR22
BMXNOC0401 versions prior to v2.11

Vulnerability Details
CVE ID: CVE-2020-7536
CVSS v3.0 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-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists that
could cause the device to be unreachable when doing an unattended modification of network
parameters over SNMP.

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Schneider Electric Security Notification
Remediations
Firmware versions below include a fix for this vulnerability and are available for download:
Affected Product & Versions

Remediation

BMXNOE0100 (H)versions prior to V3.4

Firmware V3.4 is available for download below:
https://www.se.com/ww/en/download/document/BMXNOE0
10 Exec and Release Notes/BMXNOE0110 (H)versions prior to V6.6Firmware V6.6 is available for download below:
https://www.se.com/ww/en/download/document/BMXNOE0
110 Exec and Release Notes/

Modicon M340 CPUBMXP34*
versions prior to V3.30

Firmware V3.30 is available for all the product references.
Follow this link and find the right firmware file based onmodel used:https://www.se.com/ww/en/product-range/1468-modiconm340/?parent-subcategory-id=3950

BMXNOR0200H
versions prior to V1.7 IR22

Firmware V1.7 IR22 is available for download below:
https://www.se.com/ww/en/download/document/BMXNOR0
200H_FW/BMXNOC0401
versions prior to V2.11

Firmware V2.11 is available for download below:
https://www.se.com/ww/en/product/BMXNOC0401/

Customers should use appropriate patching methodologies when applying these patches to theirsystems. We strongly recommend the use of back-ups and evaluating the impact of these patches
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 applythe following mitigations to reduce the risk of exploit:• Setup network segmentation and implement a firewall to block all unauthorized access to port

161/UDP 162/UDP.

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.

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Schneider Electric Security Notification••••••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.

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

Researcher Name

CVE-2020-7536

VAPT Team (C3i IITK, UP, India)

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, pleasecontact your local Schneider Electric representative or Schneider Electric Industrial
Cybersecurity Services. These organizations will be fully aware of this situation and can support
you through the process.
https://www.se.com/ww/en/work/support/cybersecurity/overview.jsp
https://www.se.com/ww/en/work/services/field-services/industrial-automation/industrialcybersecurity/industrial-cybersecurity.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

8-Dec-20 (13-Sep-22) Document Reference Number – SEVD-2020-343-07 V3.0Page 3 of 4Schneider Electric Security Notification“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 DISCRETION.
About 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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Revision Control:
Version 1.0
08 December 2020

Original Release

Version 2.0
09 February 2021

BMXNOC0401 added as an affected product (page 1)
Remediation section now includes BMXNOR0200H (page 2)

Version 3.0
13 September 2022

A remediation is available for Modicon M340 X80 Ethernet
Communication module BMXNOC0401 (page 2).

signed by Product Security Office
Product Security Office Digitally
Date: 2022.09.09 15:54:28 -04'00'

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