ESB-2026.6949

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.6949 ICS Advisory | ICSA-26-174-01 Siemens WinCC Certificate Manager 24 June 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: Siemens WinCC Certificate Manager Publisher: ICS-CERT Operating System: Network Appliance Resolution: Patch/Upgrade CVE Names: CVE-2026-24349 Original Bulletin: https://www.cisa.gov/news-events/ics-advisories/icsa-26-174-01 Comment: CVSS (Max): 7.1 CVE-2026-24349 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N) CVSS Source: ICS-CERT Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N EPSS (Max): 0.1% (0th) CVE-2026-24349 2026-06-23 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-26-174-01) Siemens WinCC Certificate Manager Release Date June 23, 2026 Related topics: Industrial Control System Vulnerabilities , Industrial Control Systems 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: o SIMATIC WinCC Unified PC Runtime V16 vers:all/* o SIMATIC WinCC Unified PC Runtime V17 vers:all/* o SIMATIC WinCC Unified PC Runtime V18 vers:all/* o SIMATIC WinCC Unified PC Runtime V19 vers:all/* o SIMATIC WinCC Unified PC Runtime V20 vers:all/* o SIMATIC WinCC Unified PC Runtime V21 vers:intdot/<21.0.2 CVSS Vendor Equipment Vulnerabilities v3 Siemens Siemens WinCC Certificate Cleartext Storage in a File or on 7.1 Manager Disk Background o Critical Infrastructure Sectors: Critical Manufacturing, Transportation Systems, Energy, Healthcare and Public Health, Financial Services, Government Services and Facilities o Countries/Areas Deployed: Worldwide o Company Headquarters Location: Germany --------------------------------------------------------------------------------- Vulnerabilities Expand All + 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 Mitigation The 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 planned Currently no fix is planned Vendor fix Update to V21 Update 2 or later version https://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 Vector String Severity 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 o 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 o 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 This product is provided subject to this Notification and this Privacy & Use policy. Vendor o Siemens - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. 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