Schneider Electric Security Notification
homeLYnk (Wiser For KNX) and spaceLYnk
11 May 2021 (08 November 2022)

Overview
Schneider Electric is aware of multiple vulnerabilities in its homeLYnk (Wiser For KNX) andspaceLYnk products.
HomeLYnk (Wiser for KNX) products are personalized energy efficiency solutions, offering acomplete system based on open protocols: KNX, Modbus, BACnet and IP.
spaceLYnk connects building control functions, thus achieving a complete building management
solution for small and medium as well as large buildings.
Failure to apply the remediations and mitigations provided below may risk a variety of attacks,
which could result in remote access to the product.
November 2022 Update: The CWE for CVE-2021-22737 has been updated (marked in red). No
additional action is required for customers who have already followed the remediation
instructions provided below.

Affected Products and Versions
ProductVersion

homeLYnk (Wiser For KNX)

V2.60 and priorspaceLYnk

V2.60 and priorVulnerability Details
CVE ID: CVE-2021-22732
CVSS v3.1 Base Score 8.6 | High | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
A CWE-269: Improper Privilege Management vulnerability exists that could cause a code
execution issue when an attacker loads unauthorized code on the web server.
CVE ID: CVE-2021-22733
CVSS v3.1 Base Score 7.2 | High | CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
A CWE-269: Improper Privilege Management vulnerability exists that could cause shell
access when unauthorized code is loaded into the system folder.

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Schneider Electric Security Notification
CVE ID: CVE-2021-22734
CVSS v3.1 Base Score 6.8 | Medium | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
A CWE-347: Improper Verification of Cryptographic Signature vulnerability exists that could
cause remote code execution when an attacker loads unauthorized code.
CVE ID: CVE-2021-22735
CVSS v3.1 Base Score 6.8 | Medium | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
A CWE-347: Improper Verification of Cryptographic Signature vulnerability exists that could
allow remote code execution when unauthorized code is copied to the device.
CVE ID: CVE-2021-22736
CVSS v3.1 Base Score 5.7 | Medium | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:H
A CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')vulnerability exists that could cause a denial of service when an unauthorized file is uploaded.
CVE ID: CVE-2021-22737
CVSS v3.1 Base Score 5.6 | Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
A CWE-307: Improper Restriction of Excessive Authentications Attempts vulnerability exists that
could cause unauthorized access of when credentials are discovered after a brute force attack.
CVE ID: CVE-2021-22738
CVSS v3.1 Base Score 5.6 | Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
A CWE-327: Use of a Broken or Risky Cryptographic Algorithm vulnerability exists that could
cause unauthorized access when credentials are discovered after a brute force attack.
CVE ID: CVE-2021-22739
CVSS v3.1 Base Score 5.0 | Medium | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
A CWE-200: Information Exposure vulnerability exists that could cause a device to becompromised when it is first configured.
CVE ID: CVE-2021-22740
CVSS v3.1 Base Score 4.2 | Medium | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N
A CWE-200: Information Exposure vulnerability exists that could cause information to be
exposed when an unauthorized file is uploaded.

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Schneider Electric Security Notification
Remediation
CVE

Remediation
Version 2.61 of homeLYnk (Wiser For KNX) and spaceLYnk include a fix
for these vulnerabilities and are available for download below:

CVE-2021-22732
CVE-2021-22734
CVE-2021-22735
CVE-2021-22736
CVE-2021-22739
CVE-2021-22740

homeLYnk (Wiser For KNX) V2.61 https://www.se.com/ww/en/product/LSS100100/wiser-for-knx-logiccontroller/#pdp-software
spaceLYnk V2.61 https://www.se.com/ww/en/product/LSS100200/spacelynk-logiccontroller/#pdp-software
Note: Reboot is needed after installation. Please check the version
number in the configuration to confirm the update.

CVE-2021-22733
CVE-2021-22737
CVE-2021-22738

Due to hardware limitations, these CVEs will not be fixed and customers
should immediately apply the recommendations provided in the System
Hardening Guide to reduce the risk of exploit.
System Hardening Guide for homeLYnk (Wiser For KNX) :https://download.schneider-electric.com/files?p_Doc_Ref=AN002_107
System Hardening Guide for spaceLYnk:
https://download.schneider-electric.com/files?p_Doc_Ref=AN2_107_SL

Customers should use appropriate patching methodologies when applying patches to theirsystems. 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:••Secure this device to prevent unauthorized personnel from accessing this device
Use the System Hardening Guides to protect the network and device

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.

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Schneider Electric Security Notification
••••
•
••

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.

Acknowledgements
Schneider Electric recognizes the following researcher for identifying and helping to coordinatea response to this vulnerability:
CVEResearcherCVE-2021-22732, CVE-2021-22733, CVE-2021-22734,
CVE-2021-22735, CVE-2021-22736, CVE-2021-22737,
CVE-2021-22738, CVE-2021-22739, CVE-2021-22740

Sharon Brizinov of Claroty

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

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Schneider Electric Security Notification
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
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
11 May 2021

Original Release

Version 2.0
08 November 2022

The CWE for CVE-2021-22737 has been updated(marked in red). No additional action is required forcustomers who have already followed theremediation instructions provided.

signed by Product Security Office
Product Security Office Digitally
Date: 2022.11.07 09:45:18 -05'00'

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