1. EXECUTIVE SUMMARY

CVSS v4 9.3
ATTENTION: Exploitable remotely/low attack complexity
Vendor: Vertiv
Equipment: Liebert RDU101 and Liebert UNITY
Vulnerabilities: Authentication Bypass Using an Alternate Path or Channel, Stack-based Buffer Overflow

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to cause a denial-of-service condition or achieve remote code execution

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following Vertiv products are affected:

Liebert RDU101: Versions 1.9.0.0 and prior
Liebert IS-UNITY: Versions 8.4.1.0 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1 AUTHENTICATION BYPASS USING AN ALTERNATE PATH OR CHANNEL CWE-288

Affected Vertiv products do not properly protect webserver functions that could allow an attacker to bypass authentication.

CVE-2025-46412 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2025-46412. A base score of 9.3 has been calculated; the CVSS vector string is (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.2.2 STACK-BASED BUFFER OVERFLOW CWE-121

Affected Vertiv products contain a stack based buffer overflow vulnerability. An attacker could exploit this vulnerability to gain code execution on the device.

CVE-2025-41426 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2025-41426. A base score of 9.3 has been calculated; the CVSS vector string is (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.3 BACKGROUND

CRITICAL INFRASTRUCTURE SECTORS: Communications, Energy
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: United States

3.4 RESEARCHER

Vera Mens of Claroty Team82 reported this these vulnerabilities to CISA.

4. MITIGATIONS

Vertiv recommends users take the following actions:

Update Liebert RDU101 to v1.9.1.2_0000001
Update IS-UNITY to v8.4.3.1_00160

For more information please contact Vertiv.

CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, such as:

Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
Locate control system networks and remote devices behind firewalls and isolating them from business networks.
When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.

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.

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

5. UPDATE HISTORY

May 20, 2025: Initial Publication.