Schneider Electric SESU

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1. EXECUTIVE SUMMARY

• CVSS v3 7.3
• ATTENTION: Low Attack Complexity
• Vendor: Schneider Electric
• Equipment: SESU
• Vulnerability: Improper Link Resolution Before File Access ('Link Following')

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an authenticated attacker to write arbitrary data to protected locations, potentially leading to escalation of privilege, arbitrary file corruption, exposure of application and system information or persistent denial of service when a low-privileged attacker tampers with the installation folder.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Schneider Electric reports that the following products are affected:

• Schneider Electric SESU: <3.0.12
• Schneider Electric SESU installed on Schneider Electric BESS ANSI: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric Easergy MiCOM P30: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric Easergy MiCOM P40: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric Easergy Studio: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Automation Expert: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric Harmony XB5S Soft: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric eXLhoist Configuration Software: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Automation Device Maintenance: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Machine Expert: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Machine Expert Basic: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Automation Expert Motion: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Operator Terminal Expert: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Control Expert: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Process Expert: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Process Expert for AVEVA System Platform: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Architecture Builder: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Machine Expert HVAC: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Power Operations (EPO): SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Power Commission Desktop (EPC): SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Microgrid Operations Medium: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric EcoStruxure Microgrid Flex: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric PowerLogic P5: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric PowerLogic P7: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric ZelioSoft 2: SESU versions prior to 3.0.12
• Schneider Electric SESU installed on Schneider Electric SoMove: SESU versions prior to 3.0.12

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER LINK RESOLUTION BEFORE FILE ACCESS ('LINK FOLLOWING') CWE-59

A link following vulnerability exists that could cause arbitrary data to be written to protected locations, potentially leading to escalation of privilege, arbitrary file corruption, exposure of application and system information or persistent denial of service when a low-privileged attacker tampers with the installation folder.

CVE-2025-5296 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.3 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Chemical, Commercial Facilities, Critical Manufacturing, Energy, Healthcare and Public Health, Information Technology, Transportation Systems, Water and Wastewater Systems
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: France

3.4 RESEARCHER

Sheikh Rishad reported this vulnerability to Schneider Electric.

Schneider Electric reported this vulnerability to CISA.

4. MITIGATIONS

Schneider Electric has identified the following specific workarounds and mitigations users can apply to reduce risk:

• Version 3.0.12 of SESU includes a fix for this vulnerability and is available for download here. Follow the installation instructions. If a predecessor version of SESU is already installed, then the update to V3.0.12 will be done automatically as a critical update in the background depending on the "automatic" update configuration.
• If users choose not to apply the remediation detailed above, they should immediately apply the following mitigations to reduce the risk of exploit: SESU Installation Directory (chosen by the user at installation time) should not be accessible from the network and only by trusted persons.

For more information see the associated Schneider Electric CPCERT security advisory SEVD-2025-224-03 Schneider Electric Software Update - SEVD-2025-224-03 PDF Version, Schneider Electric Software Update - SEVD-2025-224-03 CSAF Version.

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, 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). Recognize VPNs may have vulnerabilities, should be updated to the most recent version available, and are 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. 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 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. This vulnerability is not exploitable remotely.

5. UPDATE HISTORY

• September 23, 2025: Initial Republication of Schneider Electric CPCERT SEVD-2025-224-03

• Schneider Electric