Schneider Electric Security Notification
Merten KNX devices
14 February 2023

Overview
Schneider Electric is aware of a vulnerability in its Merten KNX products.
The Merten KNX products in the table below are home automation products for lighting andtemperature control.
Failure to apply the mitigations provided below may risk an authentication attack against theBCU Key, which could result in a compromised product.

Affected Products and Versions
ProductVersion

MertenINSTABUS Tastermodul 1fach System M
625199MertenINSTABUS Tastermodul 2fach System M
625299MertenTasterschnittstelle 4fach plus
670804MertenKNX ARGUS 180/2,20M UP SYSTEM
631725MertenJalousie-/Schaltaktor REG-K/8x/16x/10 m. HB
649908 (Product discontinued)
MertenKNX Uni-Dimmaktor LL REG-K/2x230/300 W
MEG6710-0002 (Product discontinued)
MertenKNX Schaltakt.2x6A UP m.2 Eing.
MEG6003-0002 (Product discontinued)

Program Version 1.0
Program Version 1.0
Program Version 1.0
Program Version 1.2
Program Version 1.0
Program Version 1.0
Program Version 1.0
Program Version 1.1
Program Version 0.1

Vulnerability Details
CVE ID: CVE-2023-25556
CVSS v3.1 Base Score 8.3 | High | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
A CWE-287: Improper Authentication vulnerability exists that could allow a device to becompromised when a key of less than seven digits is entered and the attacker has access to theKNX installation.
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Schneider Electric Security Notification
Mitigation
ProductVersion

MertenINSTABUS Tastermodul 1fach System M
625199MertenINSTABUS Tastermodul 2fach System M
625299MertenTasterschnittstelle 4fach plus
670804MertenKNX ARGUS 180/2,20M UP SYSTEM
631725MertenJalousie-/Schaltaktor REG-K/8x/16x/10 m. HB
649908 (Product discontinued)
MertenKNX Uni-Dimmaktor LL REG-K/2x230/300 W
MEG6710-0002 (Product discontinued)
MertenKNX Schaltakt.2x6A UP m.2 Eing.
MEG6003-0002 (Product discontinued)

Mitigation

Program
Version 1.0
Program
Version 1.0
Program
Version 1.0
Program
Version 1.2
Program
Version 1.0
Program
Version 1.0

Customers must request
their system integrator toincrease their BCU Key to8 digits.

Program
Version 1.0
Program
Version 1.1
Program
Version 0.1Customers should immediately apply the following mitigation to reduce the risk of exploit:

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.

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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

CVE-2023-25556Malte Küppers (FH Aachen - University of Applied 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.
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

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Schneider Electric Security Notification
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.
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 February 2023

Original Releasesigned by Product Security Office
Product Security Office Digitally
Date: 2023.02.13 13:08:53 -05'00'

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