Improper Certificate Validation Flaw Affects Multiple Siemens Apps
Summary
CISA republished Siemens ProductCERT advisory SSA-981622 warning of improper certificate validation in Siemens Analytics Toolkit (CVE-2025-40745). Affected applications fail to properly validate client certificates when connecting to Analytics Service endpoints, potentially allowing unauthenticated remote attackers to conduct man-in-the-middle attacks. Seven Siemens applications are affected across Simcenter, Solid Edge, and Tecnomatix product lines. Siemens has released vendor fixes with specific version updates for each affected product.
“Affected applications do not properly validate client certificates to connect to Analytics Service endpoint. This could allow an unauthenticated remote attacker to perform man in the middle attacks.”
Organizations running Siemens Simcenter, Solid Edge, or Tecnomatix software in operational technology or engineering environments should verify whether their deployments expose Analytics Service endpoints externally or across untrusted network segments. The man-in-the-middle attack vector requires network positioning, so the immediate remediation priority should focus on systems accessible from business networks or connected to VPN-fed remote access solutions. Given the LOW CVSS score and network-level attack complexity, this is a lower-severity but broad-surface vulnerability affecting engineering workstation populations.
What changed
CISA republished a Siemens ProductCERT security advisory describing an improper certificate validation vulnerability (CWE-295) in multiple Siemens Analytics Toolkit applications. The flaw could allow an unauthenticated remote attacker to perform man-in-the-middle attacks by failing to properly validate client certificates to the Analytics Service endpoint. The CVSS v3.1 base score is 3.7 (LOW severity) with vector AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
Organizations using affected Siemens applications (Software Center, Simcenter 3D, Simcenter Femap, Simcenter STAR-CCM+, Solid Edge SE2025/SE2026, Tecnomatix Plant Simulation) should apply vendor-provided patches immediately. CISA recommends minimizing network exposure for control system devices, locating industrial networks behind firewalls, and using VPNs for remote access when necessary. Critical manufacturing sector entities are primarily affected given the deployment scope of these industrial analytics tools.
What to do next
- Update Siemens Software Center to V3.5.8.2 or later
- Update Simcenter 3D to V2506.6000 or later
- Update Tecnomatix Plant Simulation to V2504.0008 or later
Archived snapshot
Apr 22, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
ICS Advisory
Siemens Analytics Toolkit
Release Date
April 21, 2026
Alert Code ICSA-26-111-04 Related topics: Industrial Control System Vulnerabilities, Industrial Control Systems View CSAF
Summary
Multiple Siemens applications are affected by improper certificate validation in Siemens Analytics Toolkit. This could allow an unauthenticated remote attacker to perform man in the middle attacks. Siemens has released new versions for the affected products and recommends to update to the latest versions.
The following versions of Siemens Analytics Toolkit are affected:
- Siemens Software Center vers:intdot/<3.5.8.2 (CVE-2025-40745)
- Simcenter 3D vers:intdot/<2506.6000 (CVE-2025-40745)
- Simcenter Femap vers:intdot/<2506.0002 (CVE-2025-40745)
- Simcenter STAR-CCM+ vers:intdot/<2602 (CVE-2025-40745)
- Solid Edge SE2025
- Solid Edge SE2026
- Tecnomatix Plant Simulation vers:intdot/<2504.0008 (CVE-2025-40745)
| CVSS | Vendor | Equipment | Vulnerabilities |
|---|---|---|---|
| v3 3.7 | Siemens | Siemens Analytics Toolkit | Improper Certificate Validation |
Background
- Critical Infrastructure Sectors: Critical Manufacturing
- Countries/Areas Deployed: Worldwide
- Company Headquarters Location: Germany
Vulnerabilities
Affected applications do not properly validate client certificates to connect to Analytics Service endpoint. This could allow an unauthenticated remote attacker to perform man in the middle attacks.
Affected Products
Siemens Analytics Toolkit
Vendor:
Siemens Product Version:
Siemens Software Center, Simcenter 3D, Simcenter Femap, Simcenter STAR-CCM+, Solid Edge SE2025, Solid Edge SE2026, Tecnomatix Plant Simulation Product Status:
known_affected
Remediations
Vendor fix
Update to V225.0 Update 13 or later version
https://support.sw.siemens.com/product/246738425/
Vendor fix
Update to V226.0 Update 04 or later version
https://support.sw.siemens.com/product/246738425/
Vendor fix
Update to V2504.0008 or later version
https://support.sw.siemens.com/product/297028302/
Vendor fix
Update to V2506.0002 or later version
https://support.sw.siemens.com/product/275652363/
Vendor fix
Update to V2506.6000 or later version
https://support.sw.siemens.com/product/289054037/
Vendor fix
Update to V2602 or later version
https://support.sw.siemens.com/product/226870983/
Vendor fix
Update to V3.5.8.2 or later version
https://www.sw.siemens.com/en-US/siemens-software-center/
Relevant CWE: CWE-295 Improper Certificate Validation
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
|---|---|---|---|
| 3.1 | 3.7 | LOW | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |
Acknowledgments
- Siemens ProductCERT reported this vulnerability 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 these vulnerabilities.
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-981622 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: 2026-04-14
| Date | Revision | Summary |
|---|---|---|
| 2026-04-14 | 1 | Publication Date |
| 2026-04-21 | 2 | Initial CISA Republication of Siemens ProductCERT SSA-981622 advisory |
Legal Notice and Terms of Use
This product is provided subject to this Notification and this Privacy & Use policy.
Vendor
- Siemens
Tags
Sector: Critical Manufacturing Sector Topics: Industrial Control System Vulnerabilities, Industrial Control Systems
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