Siemens RUGGEDCOM CROSSBOW Secure Access Manager Primary

Summary

Siemens released a security advisory for RUGGEDCOM CROSSBOW Secure Access Manager Primary (SAM-P) addressing CVE-2026-27668, a high-severity privilege escalation vulnerability (CVSS 8.8) affecting versions prior to 5.8. The flaw allows authenticated User Administrators to escalate privileges and grant themselves unauthorized access to any device group. The vulnerability stems from incorrect privilege assignment (CWE-266) and affects critical manufacturing infrastructure worldwide; Siemens recommends immediate update to v5.8 or later.

Full text

ICS Advisory Siemens RUGGEDCOM CROSSBOW Secure Access Manager Primary Release DateApril 21, 2026 Alert CodeICSA-26-111-02 Related topics: Industrial Control System Vulnerabilities, Industrial Control Systems View CSAF Summary RUGGEDCOM CROSSBOW Secure Access Manager Primary (SAM-P) contains a vulnerability that could allow an attacker to escalate their own privileges. Siemens has released a new version for RUGGEDCOM CROSSBOW Secure Access Manager Primary (SAM-P) and recommends to update to the latest version. The following versions of Siemens RUGGEDCOM CROSSBOW Secure Access Manager Primary are affected: RUGGEDCOM CROSSBOW Secure Access Manager Primary (SAM-P) vers:intdot/<5.8 (CVE-2026-27668) CVSS Vendor Equipment Vulnerabilities v3 8.8 Siemens Siemens RUGGEDCOM CROSSBOW Secure Access Manager Primary Incorrect Privilege Assignment Background Critical Infrastructure Sectors: Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Vulnerabilities Expand All + CVE-2026-27668 User Administrators are allowed to administer groups they belong to. This could allow an authenticated User Administrator to escalate their own privileges and grant themselves access to any device group at any access level. View CVE Details Affected Products Siemens RUGGEDCOM CROSSBOW Secure Access Manager Primary Vendor:Siemens Product Version:RUGGEDCOM CROSSBOW Secure Access Manager Primary (SAM-P) Product Status:known_affected Remediations Vendor fixUpdate to V5.8 or later versionhttps://support.industry.siemens.com/cs/ww/en/view/110000841/ Relevant CWE: CWE-266 Incorrect Privilege Assignment Metrics CVSS Version Base Score Base Severity Vector String 3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 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-741509 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-741509 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 Please share your thoughts We recently updated our anonymous product survey; we welcome your feedback. Related Advisories Apr 21, 2026 ICS Advisory | ICSA-26-111-05 Hardy Barth Salia EV Charge Controller Apr 21, 2026 ICS Advisory | ICSA-26-111-03 Siemens SINEC NMS Apr 21, 2026 ICS Advisory | ICSA-26-111-04 Siemens Analytics Toolkit Apr 21, 2026 ICS Advisory | ICSA-26-111-12 SenseLive X3050

Indicators of Compromise

• cve — CVE-2026-27668

Entities