{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Michael Messner"
        ],
        "organization": "Siemens Energy",
        "summary": "reporting this vulnerability to Siemens"
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited",
      "tlp": {
        "label": "WHITE",
        "url": "https://us-cert.cisa.gov/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "This CSAF advisory was extracted from unstructured data and may contain inaccuracies. If you notice any errors, please reach out to the designated contact at CISA CSAF: central@cisa.dhs.gov",
        "title": "CISA Disclaimer"
      },
      {
        "category": "legal_disclaimer",
        "text": "All information products included in https://us-cert.cisa.gov/ics are provided \"as is\" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.",
        "title": "Legal Notice"
      },
      {
        "category": "summary",
        "text": "Successful exploitation of this vulnerability could allow an attacker to cause the device to become unavailable until the device is restarted.",
        "title": "Risk evaluation"
      },
      {
        "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"
      },
      {
        "category": "general",
        "text": "CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.\nCISA also provides a section for control systems security recommended practices on the ICS webpage onus-cert.cisa.gov. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.\nOrganizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.",
        "title": "Recommended Practices"
      },
      {
        "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": "other",
        "text": "No known public exploits specifically target this vulnerability.",
        "title": "Exploitability"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "Email: CISAservicedesk@cisa.dhs.gov;\n Toll Free: 1-888-282-0870",
      "name": "CISA",
      "namespace": "https://www.cisa.gov/"
    },
    "references": [
      {
        "category": "external",
        "summary": "SSA-549234: Denial-of-Service Vulnerability in SIMATIC NET CP Modules - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-549234.json"
      },
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-21-257-15 JSON",
        "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2021/icsa-21-257-15.json"
      },
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-21-257-15 Web Version",
        "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-21-257-15"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://us-cert.cisa.gov/ics/alerts/ICS-ALERT-10-301-01"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B"
      },
      {
        "category": "external",
        "summary": "SSA-549234: Denial-of-Service Vulnerability in SIMATIC NET CP Modules - HTML Version",
        "url": "https://cert-portal.siemens.com/productcert/html/ssa-549234.html"
      },
      {
        "category": "external",
        "summary": "SSA-549234: Denial-of-Service Vulnerability in SIMATIC NET CP Modules - PDF Version",
        "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-549234.pdf"
      },
      {
        "category": "external",
        "summary": "SSA-549234: Denial-of-Service Vulnerability in SIMATIC NET CP Modules - TXT Version",
        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-549234.txt"
      }
    ],
    "title": "Siemens SIMATIC NET CP Modules",
    "tracking": {
      "current_release_date": "2021-09-14T00:00:00.000000Z",
      "generator": {
        "engine": {
          "name": "CISA CSAF Generator",
          "version": "1.0.0"
        }
      },
      "id": "ICSA-21-257-15",
      "initial_release_date": "2021-09-14T00:00:00.000000Z",
      "revision_history": [
        {
          "date": "2021-09-14T00:00:00.000000Z",
          "legacy_version": "Initial",
          "number": "1",
          "summary": "ICSA-21-257-15 Siemens SIMATIC NET CP Modules"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/*",
                "product": {
                  "name": "SIMATIC CP 343-1 (incl. SIPLUS variants)",
                  "product_id": "CSAFPID-0001"
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC CP 343-1 (incl. SIPLUS variants)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/*",
                "product": {
                  "name": "SIMATIC CP 343-1 Advanced (incl. SIPLUS variants)",
                  "product_id": "CSAFPID-0002"
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC CP 343-1 Advanced (incl. SIPLUS variants)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/*",
                "product": {
                  "name": "SIMATIC CP 343-1 ERPC (6GK7343-1FX00-0XE0)",
                  "product_id": "CSAFPID-0003",
                  "product_identification_helper": {
                    "model_numbers": [
                      "6GK7343-1FX00-0XE0"
                    ]
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC CP 343-1 ERPC (6GK7343-1FX00-0XE0)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/*",
                "product": {
                  "name": "SIMATIC CP 343-1 Lean (incl. SIPLUS variants)",
                  "product_id": "CSAFPID-0004"
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC CP 343-1 Lean (incl. SIPLUS variants)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/\u003cV3.3",
                "product": {
                  "name": "SIMATIC CP 443-1 (6GK7443-1EX30-0XE0)",
                  "product_id": "CSAFPID-0005",
                  "product_identification_helper": {
                    "model_numbers": [
                      "6GK7443-1EX30-0XE0"
                    ]
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC CP 443-1 (6GK7443-1EX30-0XE0)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/\u003cV3.3",
                "product": {
                  "name": "SIMATIC CP 443-1 (6GK7443-1EX30-0XE1)",
                  "product_id": "CSAFPID-0006",
                  "product_identification_helper": {
                    "model_numbers": [
                      "6GK7443-1EX30-0XE1"
                    ]
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC CP 443-1 (6GK7443-1EX30-0XE1)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/\u003cV3.3",
                "product": {
                  "name": "SIMATIC CP 443-1 Advanced (6GK7443-1GX30-0XE0)",
                  "product_id": "CSAFPID-0007",
                  "product_identification_helper": {
                    "model_numbers": [
                      "6GK7443-1GX30-0XE0"
                    ]
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC CP 443-1 Advanced (6GK7443-1GX30-0XE0)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/\u003cV3.3",
                "product": {
                  "name": "SIPLUS NET CP 443-1 (6AG1443-1EX30-4XE0)",
                  "product_id": "CSAFPID-0008",
                  "product_identification_helper": {
                    "model_numbers": [
                      "6AG1443-1EX30-4XE0"
                    ]
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "SIPLUS NET CP 443-1 (6AG1443-1EX30-4XE0)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/\u003cV3.3",
                "product": {
                  "name": "SIPLUS NET CP 443-1 Advanced (6AG1443-1GX30-4XE0)",
                  "product_id": "CSAFPID-0009",
                  "product_identification_helper": {
                    "model_numbers": [
                      "6AG1443-1GX30-4XE0"
                    ]
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "SIPLUS NET CP 443-1 Advanced (6AG1443-1GX30-4XE0)"
          }
        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-33737",
      "cwe": {
        "id": "CWE-119",
        "name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
      },
      "notes": [
        {
          "category": "summary",
          "text": "Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001",
          "CSAFPID-0002",
          "CSAFPID-0003",
          "CSAFPID-0004",
          "CSAFPID-0005",
          "CSAFPID-0006",
          "CSAFPID-0007",
          "CSAFPID-0008",
          "CSAFPID-0009"
        ]
      },
      "references": [
        {
          "summary": "CVE-2021-33737 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2021-33737.json"
        },
        {
          "category": "external",
          "summary": "web.nvd.nist.gov",
          "url": "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-33737"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "remediations": [
        {
          "category": "mitigation",
          "details": "Limit access to port 102/tcp to trusted users and systems only",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009"
          ]
        },
        {
          "category": "no_fix_planned",
          "details": "Currently no fix is planned",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update to V3.3 or later version",
          "product_ids": [
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109817938/"
        },
        {
          "category": "mitigation",
          "details": "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: \nhttps://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",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:U/RC:C",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009"
          ]
        }
      ],
      "title": "CVE-2021-33737"
    }
  ]
}