1. EXECUTIVE SUMMARY

CVSS v3 10.0
ATTENTION: Exploitable remotely/low attack complexity
Vendor: Schneider Electric
Equipment: Galaxy VS, Galaxy VL, Galaxy VXL
Vulnerability: Missing Authentication for Critical Function

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to perform unauthenticated remote code execution.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Schneider Electric products are affected:

Galaxy VS: All versions
Galaxy VL: All versions
Galaxy VXL: All versions

3.2 VULNERABILITY OVERVIEW

3.2.1 MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306

Erlang/OTP is a set of libraries for the Erlang programming language. Prior to versions OTP-27.3.3, OTP-26.2.5.11, and OTP-25.3.2.20, a SSH server may allow an attacker to perform unauthenticated remote code execution (RCE). By exploiting a flaw in SSH protocol message handling, a malicious actor could gain unauthorized access to affected systems and execute arbitrary commands without valid credentials. This issue is patched in versions OTP-27.3.3, OTP-26.2.5.11, and OTP-25.3.2.20. A temporary workaround involves disabling the SSH server or to prevent access via firewall rules.

CVE-2025-32433 has been assigned to this vulnerability. A CVSS v3.1 base score of 10.0 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

3.3 BACKGROUND

CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Critical Manufacturing, Energy
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: France

3.4 RESEARCHER

Schneider Electric reported this vulnerability to CISA.

4. MITIGATIONS

Schneider Electric is establishing a remediation plan for all future versions of Galaxy VS, Galaxy VL, and Galaxy VXL that will include a fix for this vulnerability. Schneider Electric will update this document when the remediation is available. Until then, users should immediately apply the following mitigations to reduce the risk of exploit:

Log on to the NMC4 via the Web Interface. Once logged into the system, navigate to the Console settings page from the menu bar by selecting Configuration -> Network -> Console -> Access
From the Console setting screen, uncheck the enable SSH/SFTP/SCP check box -> Click Apply
As an alternative, setup network segmentation and implement a firewall to block all unauthorized access to SSH port 22/TCP.
If assistance is needed applying the above mitigation, please contact our technical support team: https://www.se.com/ww/en/work/support/

To learn more, Schneider Electric recommends reviewing the Network Management Card 4 Security Handbook for specific actions available here to secure your devices further: https://www.se.com/us/en/download/document/SPD_CCON-B8EJSJ_EN/

To ensure you are informed of all updates, including details on affected products and remediation plans, subscribe to Schneider Electric's security notification service here: https://www.se.com/ww/en/work/support/cybersecurity/security-notifications.jsp

Schneider Electric strongly recommends the following industry cybersecurity best practices:

Locate control and safety system networks and remote devices behind firewalls and isolate 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 for that device.
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 the intended network to connect to the safety or control networks without proper sanitation.
Minimize network exposure for all control system devices and systems and ensure that they 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 the most current version available. Also, understand that VPNs are only as secure as the connected devices.

For more information see the associated Schneider Electric CPCERT security advisory SEVD-2025-133-05 Galaxy VS, Galaxy VL, Galaxy VXL - SEVD-2025-133-01 PDF Version, Galaxy VS, Galaxy VL, Galaxy VXL - SEVD-2025-133-01 CSAF Version.

CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

CISA also recommends users take the following measures to protect themselves from social engineering attacks:

Do not click web links or open attachments in unsolicited email messages.
Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

5. UPDATE HISTORY

May 20, 2025: Initial Republication of Schneider Electric CPCERT SEVD-2025-133-05