Siemens SICAM 8 Products

Summary

Multiple Siemens SICAM 8 products used in critical power infrastructure are affected by two denial-of-service vulnerabilities: CVE-2026-27663 (resource exhaustion via high-volume requests) and CVE-2026-27664 (out-of-bounds write via malicious XML). Both require remote network access and can force service crashes and device resets. Siemens has released patched firmware versions 26.10 and 26.10.0 and recommends immediate updates with validation and network segmentation.

Full text

ICS Advisory Siemens SICAM 8 Products Release DateApril 02, 2026 Alert CodeICSA-26-092-01 Related topics: Industrial Control System Vulnerabilities, Industrial Control Systems View CSAF Summary Multiple SICAM 8 products are affected by multiple vulnerabilities that could lead to denial of service, namely: - SICAM A8000 Device firmware - CPCI85 for CP-8031/CP-8050 - SICORE for CP-8010/CP-8012 - RTUM85 for CP-8010/CP-8012 - SICAM EGS Device firmware - CPCI85 - SICAM S8000 - SICORE - RTUM85 Siemens has released new versions for the affected products and recommends to update to the latest versions. The following versions of Siemens SICAM 8 Products are affected: CPCI85 Central Processing/Communication vers:intdot/<26.10 (CVE-2026-27663, CVE-2026-27664) RTUM85 RTU Base vers:intdot/<26.10 (CVE-2026-27663) SICORE Base system vers:intdot/<26.10.0 (CVE-2026-27664) CVSS Vendor Equipment Vulnerabilities v3 7.5 Siemens Siemens SICAM 8 Products Allocation of Resources Without Limits or Throttling, Out-of-bounds Write Background Critical Infrastructure Sectors: Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Vulnerabilities Expand All + CVE-2026-27663 The affected application contains denial-of-service (DoS) vulnerability. The remote operation mode is susceptible to a resource exhaustion condition when subjected to a high volume of requests. Sending multiple requests can exhaust resources, preventing parameterization and requiring a reset or reboot to restore functionality. View CVE Details Affected Products Siemens SICAM 8 Products Vendor:Siemens Product Version:CPCI85 Central Processing/Communication, RTUM85 RTU Base Product Status:known_affected Remediations Vendor fixUpdate to V26.10 or later version The firmware RTUM85 V26.10 is present within “CP-8010/CP-8012 Package” V26.10 https://support.industry.siemens.com/cs/ww/en/view/109972894/ and also within “SICAM S8000 Package” V26.10 https://support.industry.siemens.com/cs/document/109818240 Vendor fixUpdate to V26.10 or later version The firmware CPCI85 V26.10 is present within “CP-8031/CP-8050 Package” V26.10 https://support.industry.siemens.com/cs/ww/en/view/109804985/ and also within “SICAM EGS Package” V26.10 https://support.industry.siemens.com/cs/document/109972536/ Relevant CWE: CWE-770 Allocation of Resources Without Limits or Throttling Metrics CVSS Version Base Score Base Severity Vector String 3.1 6.5 MEDIUM CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVE-2026-27664 The affected application contains an out-of-bounds write vulnerability while parsing specially crafted XML inputs. This could allow an unauthenticated attacker to exploit this issue by sending a malicious XML request, which may cause the service to crash, resulting in a denial-of-service condition. View CVE Details Affected Products Siemens SICAM 8 Products Vendor:Siemens Product Version:CPCI85 Central Processing/Communication, SICORE Base system Product Status:known_affected Remediations Vendor fixUpdate to V26.10 or later version The firmware CPCI85 V26.10 is present within “CP-8031/CP-8050 Package” V26.10 https://support.industry.siemens.com/cs/ww/en/view/109804985/ and also within “SICAM EGS Package” V26.10 https://support.industry.siemens.com/cs/document/109972536/ Vendor fixUpdate to V26.10.0 or later version The firmware SICORE V26.10.0 is present within “CP-8010/CP-8012 Package” V26.10 https://support.industry.siemens.com/cs/ww/en/view/109972894/ and also within “SICAM S8000 Package” V26.10 https://support.industry.siemens.com/cs/document/109818240 Relevant CWE: CWE-787 Out-of-bounds Write 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:N/I:N/A:H Acknowledgments T. Weber, S. Dietz, D. Blagojevic, and F. Koroknai of CyberDanube coordinated disclosure of CVE-2026-27663 S. Dietz of CyberDanube and VERBUND Digital Power coordinated disclosure of CVE-2026-27664 S. Dietz of Siemens ProductCERT reported these vulnerabilities to CISA. General Recommendations Operators of critical power systems (e.g. TSOs or DSOs) worldwide are usually required by regulations to build resilience into the power grids by applying multi-level redundant secondary protection schemes. It is therefore recommended that the operators check whether appropriate resilient protection measures are in place. The risk of cyber incidents impacting the grid's reliability can thus be minimized by virtue of the grid design. Siemens strongly recommends applying the provided security updates using the corresponding tooling and documented procedures made available with the product. If supported by the product, an automated means to apply the security updates across multiple product instances may be used. Siemens strongly recommends prior validation of any security update before being applied, and supervision by trained staff of the update process in the target environment. As a general security measure Siemens strongly recommends to protect network access with appropriate mechanisms (e.g. firewalls, segmentation, VPN). It is advised to configure the environment according to our operational guidelines in order to run the devices in a protected IT environment. Recommended security guidelines can be found at: https://www.siemens.com/gridsecurity 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-246443 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 s

Indicators of Compromise

• cve — CVE-2026-27663
• cve — CVE-2026-27664

Entities