Summary
Siemens License Server is affected by multiple vulnerabilities which could allow an attacker to elevate its privileges and read arbitrary files on the system. Siemens has released a new version for Siemens License Server (SLS) and recommends to update to the latest version.
The following versions of Siemens License Server (SLS) are affected:
- Siemens License Server (SLS) vers:intdot/<5.1, vers:intdot/<5.3 (CVE-2026-69108, CVE-2026-69109)
| CVSS | Vendor | Equipment | Vulnerabilities |
|---|---|---|---|
| v3 7.5 | Siemens | Siemens License Server (SLS) | Incorrect Permission Assignment for Critical Resource, Path Traversal: '.../...//' |
Background
- Critical Infrastructure Sectors: Information Technology
- Countries/Areas Deployed: Worldwide
- Company Headquarters Location: Germany
Vulnerabilities
CVE-2026-69108
The affected application is vulnerable to a local privilege escalation due to an insecure sudoers policy. This could allow an attacker to execute arbitrary commands and plant malicious files as root, leading to full system compromise.
Affected Products
Siemens License Server (SLS)
Siemens
Siemens License Server (SLS) < V5.1
known_affected
Remediations
Vendor fix
Update to V5.1 or later version
https://support.sw.siemens.com/product/1586485382/
Relevant CWE: CWE-732 Incorrect Permission Assignment for Critical Resource
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
|---|---|---|---|
| 3.1 | 6 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N |
CVE-2026-69109
The affected application is vulnerable to a path traversal vulnerability due to lack of sanitization of user input. This could allow a remote attacker to access arbitrary files on the application.
Affected Products
Siemens License Server (SLS)
Siemens
Siemens License Server (SLS) < V5.3
known_affected
Remediations
Vendor fix
Update to V5.3 or later version
https://support.sw.siemens.com/product/1586485382/
Relevant CWE: CWE-35 Path Traversal: '.../...//'
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
|---|---|---|---|
| 3.1 | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Acknowledgments
- Siemens ProductCERT reported these vulnerabilities to CISA.
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-077553 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: 2026-08-11
| Date | Revision | Summary |
|---|---|---|
| 2026-08-11 | 1 | Publication Date |
| 2026-08-13 | 2 | Initial CISA Republication of Siemens ProductCERT SSA-077553 advisory |
Legal Notice and Terms of Use
This product is provided subject to this Notification and this Privacy & Use policy.
Vendor
- Siemens