{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited. (TLPv2: TLP:CLEAR)",
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in Desigo DXR and PXC controllers has been identified that could allow an attacker to cause denial of service conditions by sending malformed  BACnet packets. Recovery requires a device reset or reboot to restore normal functionality.\n\nSiemens has released new versions for the affected products and recommends to update to the latest versions.",
        "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\u0027 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"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "productcert@siemens.com",
      "name": "Siemens ProductCERT",
      "namespace": "https://www.siemens.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "SSA-781903: Denial of Service Vulnerability in Desigo DXR and PXC Controllers - HTML Version",
        "url": "https://cert-portal.siemens.com/productcert/html/ssa-781903.html"
      },
      {
        "category": "self",
        "summary": "SSA-781903: Denial of Service Vulnerability in Desigo DXR and PXC Controllers - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-781903.json"
      }
    ],
    "title": "SSA-781903: Denial of Service Vulnerability in Desigo DXR and PXC Controllers",
    "tracking": {
      "current_release_date": "2026-08-11T00:00:00.000Z",
      "generator": {
        "engine": {
          "name": "Siemens ProductCERT CSAF Generator",
          "version": "1"
        }
      },
      "id": "SSA-781903",
      "initial_release_date": "2026-08-11T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-08-11T00:00:00.000Z",
          "legacy_version": "1.0",
          "number": "1",
          "summary": "Publication Date"
        }
      ],
      "status": "interim",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:intdot/\u003c01.21.233.16-7862",
                "product": {
                  "name": "Desigo DXR2 \u003c V01.21.233.16-7862",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "Desigo DXR2"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:intdot/\u003c01.21.233.16-7862",
                "product": {
                  "name": "Desigo PXC3 \u003c V01.21.233.16-7862",
                  "product_id": "2"
                }
              }
            ],
            "category": "product_name",
            "name": "Desigo PXC3"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:intdot/\u003c02.21.194.36-2715",
                "product": {
                  "name": "Desigo PXC4 \u003c V02.21.194.36-2715",
                  "product_id": "3"
                }
              }
            ],
            "category": "product_name",
            "name": "Desigo PXC4"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:intdot/\u003c02.21.194.36-2715",
                "product": {
                  "name": "Desigo PXC5.E003 \u003c V02.21.194.36-2715",
                  "product_id": "4"
                }
              }
            ],
            "category": "product_name",
            "name": "Desigo PXC5.E003"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:intdot/\u003c02.21.194.36-2715",
                "product": {
                  "name": "Desigo PXC5.E24 \u003c V02.21.194.36-2715",
                  "product_id": "5"
                }
              }
            ],
            "category": "product_name",
            "name": "Desigo PXC5.E24"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:intdot/\u003c02.21.194.36-2715",
                "product": {
                  "name": "Desigo PXC7 \u003c V02.21.194.36-2715",
                  "product_id": "6"
                }
              }
            ],
            "category": "product_name",
            "name": "Desigo PXC7"
          }
        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-59693",
      "cwe": {
        "id": "CWE-754",
        "name": "Improper Check for Unusual or Exceptional Conditions"
      },
      "notes": [
        {
          "category": "description",
          "text": "The affected devices are vulnerable to a denial-of-service (DoS) vulnerability. An attacker can exploit this issue by sending a malformed BACnet packet, causing the device to stop responding to BACnet queries. Recovery requires a device reset or reboot to restore normal functionality.",
          "title": "CVE Description"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6"
        ]
      },
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Update to V01.21.233.16-7862 or later version\nPlease contact your local Siemens office for additional support in obtaining the update.",
          "product_ids": [
            "1",
            "2"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update to V02.21.194.36-2715 or later version\nPlease contact your local Siemens office for additional support in obtaining the update.",
          "product_ids": [
            "3",
            "4",
            "5",
            "6"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6"
          ]
        }
      ],
      "title": "CVE-2026-59693"
    }
  ]
}