View CSAF Summary Multiple Siemens products are affected by two local privilege escalation vulnerabilities which could allow an low privileged attacker to load malicious DLLs, potentially leading to arbitrary code execution with elevated privileges. Siemens has released new versions for the affected products and recommends to update to the latest versions. The following versions of Siemens SINEC NMS are affected: SINEC NMS: Versions prior to V4.0 SP2 (CVE-2026-25655) SINEC NMS: All Versions (CVE-2026-25656) User Management Component (UMC) vers:intdot/<2.15.2.1 (CVE-2026-25656) CVSS Vendor Equipment Vulnerabilities v3 7.8 Siemens Siemens SINEC NMS Uncontrolled Search Path Element Background Critical Infrastructure Sectors: Information Technology, Energy, Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Vulnerabilities Expand All + CVE-2026-25655 The affected application permits improper modification of a configuration file by a low-privileged user. This could allow an attacker to load malicious DLLs, potentially leading to arbitrary code execution with administrative privilege.(ZDI-CAN-28107) View CVE Details Affected Products Siemens SINEC NMS Vendor: Siemens Product Version: SINEC NMS Product Status: known_affected Remediations Vendor fix Update to V4.0 SP2 or later version Relevant CWE: CWE-427 Uncontrolled Search Path Element Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-25656 The affected application permits improper modification of a configuration file by a low-privileged user. This could allow an attacker to load malicious DLLs, potentially leading to arbitrary code execution with SYSTEM privileges.(ZDI-CAN-28108) View CVE Details Affected Products Siemens SINEC NMS Vendor: Siemens Product Version: SINEC NMS, User Management Component (UMC) Product Status: known_affected Remediations Vendor fix Update to V2.15.2.1 or later version Vendor fix Update UMC to V2.15.2.1 or later compatible version https://support.industry.siemens.com/cs/document/109996127/ Relevant CWE: CWE-427 Uncontrolled Search Path Element Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Acknowledgments Siemens ProductCERT reported these vulnerabilities to CISA. Trend Micro Zero Day Initiative reported these vulnerabilities to Siemens. General Recommendations As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity Additional Resources For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories Terms of Use The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use. Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the exploitation risk of this vulnerability. Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolate 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 recent version available. Also recognize VPN is only as secure as its 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. Advisory Conversion Disclaimer This ICSA is a verbatim republication of Siemens ProductCERT SSA-311973 from a direct conversion of the vendor's Common Security Advisory Framework (CSAF) advisory. This is republished to CISA's website as a means of increasing visibility and is provided "as-is" for informational purposes only. CISA is not responsible for the editorial or technical accuracy of republished advisories and provides no warranties of any kind regarding any information contained within this advisory. Further, CISA does not endorse any commercial product or service. Please contact Siemens ProductCERT directly for any questions regarding this advisory. Revision History Initial Release Date: 2026-02-10 Date Revision Summary 2026-02-10 1 Publication Date 2026-02-12 2 Initial CISA Republication of Siemens ProductCERT SSA-311973 advisory Legal Notice and Terms of Use