{
  "document": {
    "acknowledgments": [
      {
        "organization": "CERT@VDE",
        "summary": "coordination",
        "urls": [
          "https://www.certvde.com"
        ]
      },
      {
        "organization": "ABB",
        "summary": "reporting"
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.first.org/cvss/v3.1/specification-document#Qualitative-Severity-Rating-Scale",
      "text": "Medium"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-GB",
    "notes": [
      {
        "category": "summary",
        "text": "CODESYS PROFINET is an add\u2011on for the CODESYS Development System that provides a fully integrated PROFINET protocol stack along with diagnostic capabilities. When a PROFINET Controller is configured, this vulnerable protocol stack is downloaded to and executed by CODESYS Control runtime systems.\n\nThe vulnerability in the CODESYS PROFINET Controller is caused by an out\u2011of\u2011bounds write during the processing of received invalid PROFINET communication data. Triggering this condition causes the CODESYS Control runtime system to handle the resulting exception and stop the affected PLC application in a controlled manner. Remote code execution is not considered feasible, as the execution flow remains controlled.\n\nThis issue affects only CODESYS projects that include a PROFINET Controller configuration.",
        "title": "Summary"
      },
      {
        "category": "description",
        "text": "Exploitation of the vulnerability allows an unauthenticated attacker to trigger an exception that is handled by the CODESYS Control runtime system, resulting in a controlled stop of the affected PLC application until it is restarted.",
        "title": "Impact"
      },
      {
        "category": "description",
        "text": "Update the following product to version 4.8.0.0.\n*  CODESYS PROFINET\n\nTo make the fix effective for existing CODESYS projects, you must additionally update the PROFINET Controller in the device tree to the latest version and perform a download of the CODESYS application to the PLC.\n\nThe CODESYS Development System and the products available as CODESYS add-ons can be downloaded and installed directly with the CODESYS Installer or be downloaded from the CODESYS Store. Alternatively, as well as for all other products, you will find further information on obtaining the software update in the CODESYS Update area https://www.codesys.com/download/.",
        "title": "Remediation"
      },
      {
        "category": "general",
        "text": "As part of a security strategy, CODESYS GmbH strongly recommends at least the following best-practice\ndefense measures:\n\n* Use controllers and devices only in a protected environment to minimize network exposure and ensure that they are not accessible from outside\n* Use firewalls to protect and separate the control system network from other networks\n* Activate and apply user management and password features\n* Limit the access to both development and control system by physical means, operating system features, etc.\n* Use encrypted communication links\n* Use VPN (Virtual Private Networks) tunnels if remote access is required\n* Protect both development and control system by using up to date virus detecting solutions\n\nFor more information and general recommendations for protecting machines and plants, see also the\nCODESYS Security Whitepaper [here.](https://www.customers.codesys.com/fileadmin/data/customers/security/CODESYS-Security-Whitepaper.pdf)",
        "title": "General Recommendation"
      },
      {
        "category": "legal_disclaimer",
        "text": "CODESYS GmbH assumes no liability whatsoever for indirect, collateral, accidental or consequential losses\nthat occur by the distribution and/or use of this document or any losses in connection with the distribution and/or use of this document. All information published in this document is provided on good faith by CODESYS GmbH.\nInsofar as permissible by law, however, none of this information shall establish any guarantee, commitment or\nliability on the part of CODESYS GmbH.\n\nNote: Not all CODESYS features are available in all territories. For more information on geographic restrictions,\nplease contact sales@codesys.com.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "security@codesys.com",
      "name": "CODESYS GmbH",
      "namespace": "https://www.codesys.com"
    },
    "references": [
      {
        "category": "external",
        "summary": "CERT@VDE Security Advisories for CODESYS GmbH",
        "url": "https://www.certvde.com/en/advisories/vendor/codesys"
      },
      {
        "category": "self",
        "summary": "Advisory2026-06_VDE-2026-041: CODESYS PROFINET Controller - Out-of-bounds Write - HTML",
        "url": "https://www.certvde.com/en/advisories/VDE-2026-041/"
      },
      {
        "category": "self",
        "summary": "Advisory2026-06_VDE-2026-041: CODESYS PROFINET Controller - Out-of-bounds Write - CSAF",
        "url": "https://codesys.csaf-tp.certvde.com/.well-known/csaf/white/2026/advisory2026-06_vde-2026-041.json"
      },
      {
        "category": "external",
        "summary": "CODESYS Security Advisories",
        "url": "https://www.codesys.com/security/security-reports.html"
      },
      {
        "category": "self",
        "summary": "Advisory2026-06_VDE-2026-041: CODESYS PROFINET Controller - Out-of-bounds Write - PDF",
        "url": "https://api-www.codesys.com/fileadmin/user_upload/CODESYS_Group/Ecosystem/Up-to-Date/Security/Security-Advisories/Advisory2026-06_PN-927.pdf"
      }
    ],
    "title": "CODESYS PROFINET Controller - Out-of-bounds Write",
    "tracking": {
      "aliases": [
        "VDE-2026-041",
        "CODESYS Security Advisory 2026-06"
      ],
      "current_release_date": "2026-07-29T10:00:00.000Z",
      "generator": {
        "date": "2026-07-29T07:00:17.279Z",
        "engine": {
          "name": "Secvisogram",
          "version": "2.6.4"
        }
      },
      "id": "Advisory2026-06_VDE-2026-041",
      "initial_release_date": "2026-07-29T10:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-07-29T10:00:00.000Z",
          "number": "1.0.0",
          "summary": "Initial revision."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "product_version_range",
                    "name": "vers:generic/\u003e=4.4.0.0|\u003c4.8.0.0",
                    "product": {
                      "name": "CODESYS PROFINET 4.4.0.0 \u003c 4.8.0.0",
                      "product_id": "CSAFPID-51001"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "4.8.0.0",
                    "product": {
                      "name": " CODESYS PROFINET 4.8.0.0",
                      "product_id": "CSAFPID-52001"
                    }
                  }
                ],
                "category": "product_name",
                "name": " CODESYS PROFINET"
              }
            ],
            "category": "product_family",
            "name": "Software"
          }
        ],
        "category": "vendor",
        "name": "CODESYS"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-35226",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "notes": [
        {
          "audience": "all",
          "category": "description",
          "text": "An out\u2011of\u2011bounds write vulnerability in the CODESYS PROFINET Controller allows an unauthenticated attacker on the same network segment to send malformed PROFINET communication data that triggers an exception in the affected PLC application. The exception is handled by the CODESYS Control runtime system and results in a controlled stop of the PLC application.",
          "title": "CVE Description"
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-52001"
        ],
        "known_affected": [
          "CSAFPID-51001"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - 7.1 / High",
          "url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Update the following product to version 4.8.0.0.\n*  CODESYS PROFINET\n\nTo make the fix effective for existing CODESYS projects, you must additionally update the PROFINET Controller in the device tree to the latest version and perform a download of the CODESYS application to the PLC.\n\nThe CODESYS Development System and the products available as CODESYS add-ons can be downloaded and installed directly with the CODESYS Installer or be downloaded from the CODESYS Store. Alternatively, as well as for all other products, you will find further information on obtaining the software update in the CODESYS Update area https://www.codesys.com/download/.",
          "product_ids": [
            "CSAFPID-51001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "environmentalScore": 6.5,
            "environmentalSeverity": "MEDIUM",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 6.5,
            "temporalSeverity": "MEDIUM",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-51001"
          ]
        }
      ],
      "title": "Out-of-bounds Write in CODESYS PROFINET Controller"
    }
  ]
}