{ "document": { "acknowledgments": [ { "names": [ "Qiguang Zhang", "Zhen Ling", "Junzhou Luo", "Chongqing Lei" ], "organization": "Southeast University;" }, { "names": [ "Xinwen Fu" ], "organization": "University of Massachusetts Lowell" }, { "names": [ "Yue Zhang" ], "organization": "Shandong University", "summary": "reporting this vulnerability through responsible disclosure." } ], "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": "ABB has been contacted by a researcher who identified a vulnerability in one of its products. ABB has been contacted by a researcher who identified a vulnerability in one of its products. The vulnerability report has been shared in responsible disclosure. \n\nAn attacker who successfully exploited this vulnerability could cause the product to become unusable.\nABB confirms the vulnerability but at the same time acknowledges that the issue affects exclusively classic KNX devices that are not supporting the latest KNX Secure standard. Due to a lack of security in legacy KNX devices, the issue cannot be resolved via a software change. In order to actively exploit this vulnerability, an attacker requires physical access to the bus, the affected device is connected to.\n\nABB has no plans of corrective measures. ", "title": "Summary" }, { "category": "other", "text": "For additional instructions and support please contact your local ABB service organization. For contact information, see www.abb.com/contactcenters.\n\nInformation about ABB\u2019s cyber security program and capabilities can be found at www.abb.com/cybersecurity.", "title": "Support" }, { "category": "legal_disclaimer", "text": "The information in this document is subject to change without notice, and should not be construed as a commitment by ABB.\n\nABB provides no warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, for the information contained in this document, and assumes no responsibility for any errors that may appear in this document. In no event shall ABB or any of its suppliers be liable for direct, indirect, special, incidental or consequential damages of any nature or kind arising from the use of this document, or from the use of any hardware or software described in this document, even if ABB or its suppliers have been advised of the possibility of such damages.\n\nThis document and parts hereof must not be reproduced or copied without written permission from ABB, and the contents hereof must not be imparted to a third party nor used for any unauthorized purpose.\n\nAll rights to registrations and trademarks reside with their respective owners.\n", "title": "Notice" }, { "category": "other", "text": "ABB strongly recommends customers to follow the steps described in section: Error! Reference source not found.. In addition, it is recommended to:\n\n- Harden the KNX system by only allowing operations and services necessary for the specified functionality of that system.\n\n- Isolate special purpose networks (e.g. for automation systems) and remote devices behind firewalls and separate them from any general-purpose network (e.g. office or home networks).\n\n- Install physical controls so no unauthorized personnel can access your devices, components, peripheral equipment, and networks.\n\n- Never connect programming software or computers containing programing software to any net-work other than the network for the devices that it is intended for.\n\n- Scan all data imported into your environment before use to detect potential malware infections.\n\n- Minimize network exposure for all applications and endpoints to ensure that they are not accessible from the Internet unless they are designed for such exposure and the intended use requires such.\n\n- Ensure all nodes are always up to date in terms of installed software, operating system, and firmware patches as well as anti-virus and firewall.\n\n- When remote access is required, use secure methods, such as Virtual Private Networks (VPNs). Recognize that VPNs may have vulnerabilities and should be updated to the most current version available.\nAlso, understand that VPNs are only as secure as the connected devices.\n\nMore information on recommended practices can be found in the documents listed in the Error! Reference source not found. section.\n", "title": "General security recommendations" }, { "category": "other", "text": "ABB has a rigorous internal cyber security continuous improvement process which involves regular testing with industry leading tools and periodic assessments to identify potential product issues. Occasionally an issue is determined to be a design or coding flaw with implications that may impact product cyber security.\n\nWhen a potential product vulnerability is identified or reported, ABB immediately initiates our vulnerability handling process. This entails validating if the issue is in fact a product issue, identifying root causes, determining what related products may be impacted, developing a remediation, and notifying end users and governmental organizations.\n\nThe resulting Cyber Security Advisory intends to notify customers of the vulnerability and provide details on which products are impacted, how to mitigate the vulnerability or explain workarounds that minimize the potential risk as much as possible. The release of a Cyber Security Advisory should not be misconstrued as an affirmation or indication of an active threat or ongoing campaign targeting the products mentioned here. If ABB is aware of any specific threats, it will be clearly mentioned in the communication.\n\nThe publication of this Cyber Security Advisory is an example of ABB\u2019s commitment to the user community in support of this critical topic. Responsible disclosure is an important element in the chain of trust we work to maintain with our many customers. The release of an Advisory provides timely information which is essential to help ensure our customers are fully informed.", "title": "Purpose" }, { "category": "faq", "text": "What causes the vulnerability?\n- The vulnerability is a result of missing security features which were never specified for ABB legacy KNX products.\n\nWhat is BJE/ABB Firmware-Update 2.0?\n- The ETS app \u201cABB Firmware Update 2.0\u201d and \u201cBJE Firmware Update 2.0\u201d is used to update the firmware of various ABB KNX devices directly via the KNX bus. The latest firmware files can be downloaded automatically from the Internet or imported manually.\n\n The app can be used with ETS 5 or later.\n\nWhat might an attacker use the vulnerability to do?\n- An attacker who successfully exploited this vulnerability could cause the affected product to stop working properly if physical access is given to the bus, the product is connected to. In cases the attacker is capable to reverse engineer the firmware of the product, (s)he could change the product behavior. It is a duty of the product and system owner to ensure that physical access to the field bus is limited to authorized personal.\n\nHow could an attacker exploit the vulnerability?\n- An attacker could try to exploit the vulnerability by tampering the firmware image or intercept the data flow between the device and the firmware update tool.\n\nCould the vulnerability be exploited remotely?\n- No, to exploit this vulnerability an attacker would need to have physical access to an affected system node. It is assumed that the system is set up in accordance with commonly accepted security practices.\n\nCan functional safety be affected by an exploit of this vulnerability?\n- KNX devices are not in scope of functional safety standards.\n\nWhy does ABB have no plans for corrective measures?\n- The security features, that are needed to fix this vulnerability with a perfect technical approach, cannot be delivered with a Software update.\n\nWhen this security advisory was issued, had this vulnerability been publicly disclosed?\n- No, ABB received information about this vulnerability through responsible disclosure. \n\nWhen this security advisory was issued, had ABB received any reports that this vulnerability was being exploited?\n- No, ABB had not received any information indicating that this vulnerability had been exploited when this security advisory was originally issued.", "title": "Frequently Asked Questions" }, { "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 ABB PSIRT 9AKK108472A9270 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 ABB PSIRT 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": "Switzerland", "title": "Company headquarters location" } ], "publisher": { "category": "other", "contact_details": "central@cisa.dhs.gov", "name": "CISA", "namespace": "https://www.cisa.gov/" }, "references": [ { "category": "self", "summary": "ABB CYBERSECURITY ADVISORY - CSAF Version ", "url": "https://psirt.abb.com/csaf/2026/9akk108472a9270.json" }, { "category": "self", "summary": "ABB CYBERSECURITY ADVISORY - PDF Version ", "url": "https://search.abb.com/library/Download.aspx?DocumentID=9AKK108472A9270&LanguageCode=en&DocumentPartId=pdf&Action=Launch" }, { "summary": "Cybersecurity Protection for Smart Buildings ", "url": "https://new.abb.com/low-voltage/products/building-automation/product-range/abb-i-bus-knx/cybersecurity-protection-for-smart-buildings" }, { "category": "self", "summary": "ICS Advisory ICSA-26-209-07 JSON", "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-209-07.json" }, { "category": "self", "summary": "ICS Advisory ICSA-26-209-07 - Web Version", "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-209-07" }, { "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": "ABB KNX Update Tool", "tracking": { "current_release_date": "2026-07-28T06:00:00.000000Z", "generator": { "date": "2026-07-23T12:41:51.745742Z", "engine": { "name": "CISA CSAF Generator", "version": "1.5.0" } }, "id": "ICSA-26-209-07", "initial_release_date": "2026-07-17T00:30:00.000000Z", "revision_history": [ { "date": "2026-07-17T00:30:00.000000Z", "legacy_version": "Initial", "number": "1", "summary": "Initial version" }, { "date": "2026-07-28T06:00:00.000000Z", "legacy_version": "CISA Republication", "number": "2", "summary": "Initial CISA Republication of ABB PSIRT 9AKK108472A9270 advisory" } ], "status": "final", "version": "2" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "<=2.0.175", "product": { "name": "KNX Update Tool (ABB) <=2.0.175", "product_id": "CSAFPID-0001" } } ], "category": "product_name", "name": "KNX Update Tool (ABB)" }, { "branches": [ { "category": "product_version_range", "name": "<=2.0.175", "product": { "name": "KNX Update Tool (BJE) <=2.0.175", "product_id": "CSAFPID-0002" } } ], "category": "product_name", "name": "KNX Update Tool (BJE)" } ], "category": "vendor", "name": "ABB" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-12705", "cwe": { "id": "CWE-353", "name": "Missing Support for Integrity Check" }, "notes": [ { "category": "description", "text": "There is no protection of the integrity of the firmware image. This applies exclusively to legacy KNX products", "title": "CVE description" } ], "product_status": { "known_affected": [ "CSAFPID-0001", "CSAFPID-0002" ] }, "references": [ { "category": "external", "summary": "NVD - CVE-2026-12705", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-12705" }, { "category": "external", "summary": "www.cve.org", "url": "https://www.cve.org/CVERecord?id=CVE-2026-12705" }, { "category": "external", "summary": "cwe.mitre.org", "url": "https://cwe.mitre.org/data/definitions/353.html" }, { "category": "external", "summary": "www.first.org", "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H/E:F/RL:U/RC:C" } ], "remediations": [ { "category": "mitigation", "details": "Due to the nature of the classic KNX protocol stack and security concept, there are no options to resolve the vulnerability with a software update on a technical level.\n\nABB recommends to follow general security recommendations listed in the security guideline (see References and General security recommendations). In addition, it shall be avoided to control sensitive functionality by legacy KNX devices such as, but not limited to, access control to e.g. hotel rooms or other protected areas.\n\nNote: Legacy KNX standards were never designed to meet state of the art security standards like introduced with KNX Data Secure published in 2017.", "product_ids": [ "CSAFPID-0001", "CSAFPID-0002" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "HIGH", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "environmentalScore": 6.3, "environmentalSeverity": "MEDIUM", "exploitCodeMaturity": "FUNCTIONAL", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "remediationLevel": "UNAVAILABLE", "reportConfidence": "CONFIRMED", "scope": "UNCHANGED", "temporalScore": 6.3, "temporalSeverity": "MEDIUM", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H/E:F/RL:U/RC:C", "version": "3.1" }, "products": [ "CSAFPID-0001", "CSAFPID-0002" ] } ], "title": "CVE-2026-12705" } ] }