{
  "document": {
    "acknowledgments": [
      {
        "organization": "ABB PSIRT",
        "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": "ABB is aware of vulnerabilities in the product versions listed as affected in the advisory.\nThe vulnerability enables unauthorized access to the Reboot OS function within the Remote Transport Service, allowing an attacker to trigger a system reboot without the required authentication. This functionality initiates a system reboot on the target machine. However, remote exploitation of this vulnerability is not feasible unless the attacker has already gained access to the network where the affected ABB Ability\u2122 zenon system is deployed.\nAt the time of writing, there is no evidence that this vulnerability is being actively exploited in the wild.\n",
        "title": "summary"
      },
      {
        "category": "other",
        "text": "\u2022ABB recommends installing only the Service Engine component on production systems and installing the Engineering Studio on a separate dedicated Engineering station. Physical, local access to systems with the ABB AbilityTM zenon Software Platform should be restricted to authorized users only in an environment with physical access control measures in place.\n\u2022ABB recommends that system integrators and asset owners conduct their own risk assessments to determine appropriate mitigation strategies.\n\u2022ABB recommends keeping the operating system and software up to date\n",
        "title": "General security recommendations"
      },
      {
        "category": "other",
        "text": "For additional instructions and support please contact your local ABB service organization. \nFor contact \ninformation, see www.abb.com/contactcenters.\n\nInformation about ABB\u2019s cyber security program and capabilities can be found at www.abb.com/cybersecurity.\n",
        "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 hard-ware 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": "general",
        "text": "\u2022\tRestrict network access to systems with the ABB zenon Software Platform installed. \n\n-\tEnsure that access to a system is restricted by implementing access controls to minimize the risk of unauthorized access.\n\n\u2022\tAssess the necessity of the ABB zenon Remote Transport functionality.\n\n\n-\tEnsure that if the Remote Transport functionality is not used, the zensyssrv.exe (ABB zenon System Service) is stopped or terminated. The zensyssrv.exe can also be stopped or terminated after authorized use to prevent this vulnerability.\n",
        "title": "Work around"
      },
      {
        "category": "legal_disclaimer",
        "text": "This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy \u0026 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 2NGA002743 from a direct conversion of the vendor\u0027s Common Security Advisory Framework (CSAF) advisory. This is republished to CISA\u0027s 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": "Chemical, Communications, Critical Manufacturing, Dams, Energy, Healthcare and Public Health, Information Technology, Water and Wastewater",
        "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/2025/2nga002743.json"
      },
      {
        "category": "self",
        "summary": "ABB CYBERSECURITY ADVISORY - PDF version ",
        "url": "https://search.abb.com/library/Download.aspx?DocumentID=2NGA002743\u0026LanguageCode=en\u0026DocumentPartId=pdf\u0026Action=Launch"
      },
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-26-146-03 JSON",
        "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-146-03.json"
      },
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-26-146-03 - Web Version",
        "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-146-03"
      },
      {
        "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 AbilityTM Zenon Remote Transport Vulnerability",
    "tracking": {
      "current_release_date": "2026-05-26T06:00:00.000000Z",
      "generator": {
        "date": "2026-05-26T13:10:30.628165Z",
        "engine": {
          "name": "CISA CSAF Generator",
          "version": "1.5.0"
        }
      },
      "id": "ICSA-26-146-03",
      "initial_release_date": "2025-08-12T00:30:00.000000Z",
      "revision_history": [
        {
          "date": "2025-08-12T00:30:00.000000Z",
          "legacy_version": "Initial",
          "number": "1",
          "summary": "Initial version."
        },
        {
          "date": "2026-05-26T06:00:00.000000Z",
          "legacy_version": "CISA Republication",
          "number": "2",
          "summary": "Initial CISA Republication of ABB PSIRT 2NGA002743 advisory"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c=14",
                "product": {
                  "name": "AbilityTM zenon versions \u003e=7.50 to \u003c=14",
                  "product_id": "CSAFPID-0001"
                }
              }
            ],
            "category": "product_name",
            "name": "AbilityTM zenon "
          }
        ],
        "category": "vendor",
        "name": "ABB"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-8754",
      "cwe": {
        "id": "CWE-306",
        "name": "Missing Authentication for Critical Function"
      },
      "notes": [
        {
          "category": "description",
          "text": "In the default configuration of the ABB zenon software platform, the zensyssrv.exe service is set to start automatically. To utilize the Remote Transport Service, users are required to configure a password beforehand. However, a security vulnerability has been identified that enables unauthorized attackers to bypass authentication mechanisms and remotely initiate a system reboot without proper authorization",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "NVD -CVE-2025-8754",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-8754"
        },
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-8754"
        },
        {
          "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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "remediations": [
        {
          "category": "workaround",
          "details": "\u2022\tRestrict network access to systems with the ABB zenon Software Platform installed. \n\n-\tEnsure that access to a system is restricted by implementing access controls to minimize the risk of unauthorized access.\n\n\n\u2022\tAssess the necessity of the ABB zenon Remote Transport functionality.\n\n-\tEnsure that if the Remote Transport functionality is not used, the zensyssrv.exe (ABB zenon System Service) is stopped or terminated. The zensyssrv.exe can also be stopped or terminated after authorized use to prevent this vulnerability.\n",
          "product_ids": [
            "CSAFPID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "environmentalScore": 7.5,
            "environmentalSeverity": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 7.5,
            "temporalSeverity": "HIGH",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001"
          ]
        }
      ],
      "title": "CVE-2025-8754"
    }
  ]
}