{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-37204",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-37204",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2022-02-09T15:16:56.000Z",
    "updatedAt": "2025-04-18T18:33:01.575Z",
    "importedAt": "2026-10-24T01:56:32.228Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": null,
      "summary": "A vulnerability has been identified in SIMATIC Drive Controller family (All versions < V2.9.2), SIMATIC Drive Controller family (All versions >= V2.9.2 < V2.9.4), SIMATIC ET 200SP Open Controller CPU 1515SP PC (incl. SIPLUS variants) (All versions), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions < V21.9), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions >= V21.9 < V21.9.4), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 Ready4Linux (All versions), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (All versions < V4.5.0), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (All versions >= V4.5.0 < V4.5.2), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions < V2.9.2), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions >= V2.9.2 < V2.9.4), SIMATIC S7-1500 Software Controller (All versions < V21.9), SIMATIC S7-1500 Software Controller (All versions >= V21.9 < V21.9.4), SIMATIC S7-PLCSIM Advanced (All versions < V4.0), SIMATIC S7-PLCSIM Advanced (All versions >= V4.0 < V4.0 SP1), SIPLUS TIM 1531 IRC (All versions < V2.3.6), TIM 1531 IRC (All versions < V2.3.6). An unauthenticated attacker could cause a denial-of-service condition in a PLC when sending specially prepared packet over port 102/tcp. A restart of the affected device is needed to restore normal operations.",
      "affected": [
        {
          "vendor": "Siemens",
          "product": "SIMATIC Drive Controller family",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions < V2.9.2",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC Drive Controller family",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions >= V2.9.2 < V2.9.4",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC ET 200SP Open Controller CPU 1515SP PC (incl. SIPLUS variants)",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants)",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions < V21.9",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants)",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions >= V21.9 < V21.9.4",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC ET 200SP Open Controller CPU 1515SP PC2 Ready4Linux",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1200 CPU family (incl. SIPLUS variants)",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions < V4.5.0",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1200 CPU family (incl. SIPLUS variants)",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions >= V4.5.0 < V4.5.2",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants)",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions < V2.9.2",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants)",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions >= V2.9.2 < V2.9.4",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 Software Controller",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions < V21.9",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 Software Controller",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions >= V21.9 < V21.9.4",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-PLCSIM Advanced",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions < V4.0",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-PLCSIM Advanced",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions >= V4.0 < V4.0 SP1",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIPLUS TIM 1531 IRC",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions < V2.3.6",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "TIM 1531 IRC",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "All versions < V2.3.6",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}