{ "document": { "acknowledgments": [ { "organization": "Siemens ProductCERT", "summary": "reported this vulnerability to CISA." } ], "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Disclosure is not limited", "tlp": { "label": "WHITE", "url": "https://www.cisa.gov/news-events/news/traffic-light-protocol-tlp-definitions-and-usage" } }, "lang": "en", "notes": [ { "category": "summary", "text": "Opcenter RDnL is affected by missing authentication in critical function in \u2018ActiveMQ Artemis\u2019. An unauthenticated attacker within the adjacent network could use the Core protocol to force a target broker to establish an outbound Core federation connection to an attacker-controlled rogue broker. This could potentially result in availability impacts or message injection into any queue via the rogue broker. Breaking the integrity of a message has a low impact due to missing auto refresh functionality and it does not contain any confidential information.\n\nActiveMQ Artemis has released a new version and Siemens recommends to update to the latest version.", "title": "Summary" }, { "category": "general", "text": "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.\nAdditional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity", "title": "General Recommendations" }, { "category": "general", "text": "For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories", "title": "Additional Resources" }, { "category": "legal_disclaimer", "text": "The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use.", "title": "Terms of Use" }, { "category": "legal_disclaimer", "text": "This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).", "title": "Legal Notice and Terms of Use" }, { "category": "other", "text": "This ICSA is a verbatim republication of Siemens ProductCERT SSA-085541 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.", "title": "Advisory Conversion Disclaimer" }, { "category": "general", "text": "CISA recommends users take defensive measures to minimize the exploitation risk of these vulnerabilities.", "title": "Recommended Practices" }, { "category": "general", "text": "Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet.", "title": "Recommended Practices" }, { "category": "general", "text": "Locate control system networks and remote devices behind firewalls and isolate them from business networks.", "title": "Recommended Practices" }, { "category": "general", "text": "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.", "title": "Recommended Practices" }, { "category": "general", "text": "CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.", "title": "Recommended Practices" }, { "category": "general", "text": "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.", "title": "Recommended Practices" }, { "category": "general", "text": "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.", "title": "Recommended Practices" }, { "category": "general", "text": "Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.", "title": "Recommended Practices" }, { "category": "other", "text": "Critical Manufacturing", "title": "Critical infrastructure sectors" }, { "category": "other", "text": "Worldwide", "title": "Countries/areas deployed" }, { "category": "other", "text": "Germany", "title": "Company headquarters location" } ], "publisher": { "category": "other", "contact_details": "central@cisa.dhs.gov", "name": "CISA", "namespace": "https://www.cisa.gov/" }, "references": [ { "category": "self", "summary": "SSA-085541: Missing Authentication in Critical Function in ActiveMQ Artemis (CVE-2026-27446) in Opcenter RDnL - CSAF Version", "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-085541.json" }, { "category": "self", "summary": "SSA-085541: Missing Authentication in Critical Function in ActiveMQ Artemis (CVE-2026-27446) in Opcenter RDnL - HTML Version", "url": "https://cert-portal.siemens.com/productcert/html/ssa-085541.html" }, { "category": "self", "summary": "ICS Advisory ICSA-26-134-09 JSON", "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-134-09.json" }, { "category": "self", "summary": "ICS Advisory ICSA-26-134-09 - Web Version", "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-134-09" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/resources-tools/resources/ics-recommended-practices" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/topics/industrial-control-systems" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/news-events/news/targeted-cyber-intrusion-detection-and-mitigation-strategies-update-b" } ], "title": "Siemens Opcenter RDnL", "tracking": { "current_release_date": "2026-05-14T06:00:00.000000Z", "generator": { "date": "2026-05-13T15:57:11.778178Z", "engine": { "name": "CISA CSAF Generator", "version": "1.5.0" } }, "id": "ICSA-26-134-09", "initial_release_date": "2026-05-12T00:00:00.000000Z", "revision_history": [ { "date": "2026-05-12T00:00:00.000000Z", "legacy_version": "Initial", "number": "1", "summary": "Publication Date" }, { "date": "2026-05-14T06:00:00.000000Z", "legacy_version": "CISA Republication", "number": "2", "summary": "Initial CISA Republication of Siemens ProductCERT SSA-085541 advisory" } ], "status": "final", "version": "2" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:all/*", "product": { "name": "Opcenter RDnL", "product_id": "CSAFPID-0001" } } ], "category": "product_name", "name": "Opcenter RDnL" } ], "category": "vendor", "name": "Siemens" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-27446", "cwe": { "id": "CWE-306", "name": "Missing Authentication for Critical Function" }, "notes": [ { "category": "summary", "text": "Missing Authentication for Critical Function (CWE-306) vulnerability in Apache Artemis, Apache ActiveMQ Artemis. An unauthenticated remote attacker can use the Core protocol to force a target broker to establish an outbound Core federation connection to an attacker-controlled rogue broker. This could potentially result in message injection into any queue and/or message exfiltration from any queue via the rogue broker. This impacts environments that allow both:\r\n\r\n- incoming Core protocol connections from untrusted sources to the broker\r\n\r\n- outgoing Core protocol connections from the broker to untrusted targets", "title": "Summary" }, { "category": "summary", "text": "ActiveMQ Artemis is used for Async processing between different web applications. Any message processed by a consumer will apply schema validation first. Message sent by Opcenter RD&L to ActiveMQ does not contain any confidential information. Breaking the integrity of a message has a low impact (missing auto refresh functionality). Access to ActiveMQ is only allowed within the Data Center. Inbound connections to the Data Center to port 61616 (default) should be blocked.", "title": "For Opcenter RDnL" } ], "product_status": { "known_affected": [ "CSAFPID-0001" ] }, "references": [ { "category": "external", "summary": "www.cve.org", "url": "https://www.cve.org/CVERecord?id=CVE-2026-27446" }, { "category": "external", "summary": "cwe.mitre.org", "url": "https://cwe.mitre.org/data/definitions/306.html" }, { "category": "external", "summary": "www.first.org", "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H" } ], "remediations": [ { "category": "mitigation", "details": "Implement and deploy a Core interceptor to deny all Core downstream federation connect packets. Such packets have a type of (int) -16 or (byte)\u00a00xfffffff0. Documentation for interceptors is available at\u00a0 https://artemis.apache.org/components/artemis/documentation/latest/intercepting-operations.html .", "product_ids": [ "CSAFPID-0001" ] }, { "category": "mitigation", "details": "Remove Core protocol support from any acceptor receiving connections from untrusted sources. Incoming Core protocol connections are supported by default via the \"artemis\" acceptor listening on port 61616. See the \"protocols\" URL parameter configured for the acceptor. An acceptor URL without this parameter supports all protocols by default, including Core", "product_ids": [ "CSAFPID-0001" ] }, { "category": "mitigation", "details": "Use two-way SSL (i.e. certificate-based authentication) in order to force every client to present the proper SSL certificate when establishing a connection before any message protocol handshake is attempted. This will prevent unauthenticated exploitation of this vulnerability", "product_ids": [ "CSAFPID-0001" ] }, { "category": "vendor_fix", "details": "Update to Apache Artemis version 2.52.0 or later version", "product_ids": [ "CSAFPID-0001" ] } ], "scores": [ { "cvss_v3": { "baseScore": 7.1, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "version": "3.1" }, "products": [ "CSAFPID-0001" ] } ], "title": "CVE-2026-27446" } ] }