Siemens WinCC Certificate Manager

View CSAF
Summary
WinCC Certificate Manager insufficiently protects key material that could allow an attacker to extract sensitive information. Siemens has released a new version for SIMATIC WinCC Unified PC Runtime V21 and recommends to update to the latest version. Siemens recommends specific countermeasures for products where fixes are not, or not yet available.
The following versions of Siemens WinCC Certificate Manager are affected:

SIMATIC WinCC Unified PC Runtime V16 vers:all/*ÿ
SIMATIC WinCC Unified PC Runtime V17 vers:all/*ÿ
SIMATIC WinCC Unified PC Runtime V18 vers:all/*ÿ
SIMATIC WinCC Unified PC Runtime V19 vers:all/*ÿ
SIMATIC WinCC Unified PC Runtime V20 vers:all/*ÿ
SIMATIC WinCC Unified PC Runtime V21 vers:intdot/<21.0.2





CVSS
Vendor
Equipment
Vulnerabilities




v3 7.1
Siemens
Siemens WinCC Certificate Manager
Cleartext Storage in a File or on Disk




Background

Critical Infrastructure Sectors: Critical Manufacturing, Transportation Systems, Energy, Healthcare and Public Health, Financial Services, Government Services and Facilities
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany


Vulnerabilities

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CVE-2026-24349

Insufficient protection of key material in WinCC Certificate Manager that could allow an attacker to extract sensitive information.
View CVE Details

Affected Products
Siemens WinCC Certificate Manager

Vendor:Siemens
Product Version:SIMATIC WinCC Unified PC Runtime V16, SIMATIC WinCC Unified PC Runtime V17, SIMATIC WinCC Unified PC Runtime V18, SIMATIC WinCC Unified PC Runtime V19, SIMATIC WinCC Unified PC Runtime V20, SIMATIC WinCC Unified PC Runtime V21
Product Status:known_affected


Remediations
MitigationThe affected product may be operated only by personnel qualified for the specific task in accordance with the relevant documentation, in particular its warning notices and safety instructions. Qualified personnel are those who, based on their training and experience, are capable of identifying risks and avoiding potential hazards when working with the affected product.
No fix plannedCurrently no fix is planned
Vendor fixUpdate to V21 Update 2 or later versionhttps://support.industry.siemens.com/cs/ww/en/view/109991140/

Relevant CWE: CWE-313 Cleartext Storage in a File or on Disk

Metrics




CVSS Version
Base Score
Base Severity
Vector String




3.1
7.1
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/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-063511 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: 2026-06-09




Date
Revision
Summary




2026-06-09
1
Publication Date


2026-06-23
2
Initial CISA Republication of Siemens ProductCERT SSA-063511 advisory




Legal Notice and Terms of Use

https://www.cisa.gov/news-events/ics-advisories/icsa-26-174-01

2026-06-23 12:00 UTC
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