{
  "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-2025-40944",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-40944",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2026-01-13T09:44:05.792Z",
    "updatedAt": "2026-06-09T08:46:51.475Z",
    "importedAt": "2026-10-24T01:57:34.152Z",
    "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 ET 200AL IM 157-1 PN (6ES7157-1AB00-0AB0) (All versions), SIMATIC ET 200MP IM 155-5 PN HF (6ES7155-5AA00-0AC0) (All versions >= V4.2.0), SIMATIC ET 200SP IM 155-6 MF HF (6ES7155-6MU00-0CN0) (All versions), SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants) (All versions < V1.3), SIMATIC ET 200SP IM 155-6 PN R1 (6ES7155-6AU00-0HM0) (All versions < V6.0.1), SIMATIC ET 200SP IM 155-6 PN/2 HF (6ES7155-6AU01-0CN0) (All versions >= V4.2.0 < V4.2.5), SIMATIC ET 200SP IM 155-6 PN/3 HF (6ES7155-6AU30-0CN0) (All versions < V4.2.2), SIMATIC PN/MF Coupler (6ES7158-3MU10-0XA0) (All versions), SIMATIC PN/PN Coupler (6ES7158-3AD10-0XA0) (All versions < V6.0.0), SIPLUS ET 200MP IM 155-5 PN HF (6AG1155-5AA00-2AC0) (All versions >= V4.2.0), SIPLUS ET 200MP IM 155-5 PN HF (6AG1155-5AA00-7AC0) (All versions >= V4.2.0), SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL (6AG2155-5AA00-1AC0) (All versions >= V4.2.0), SIPLUS ET 200SP IM 155-6 PN HF (6AG1155-6AU01-2CN0) (All versions >= V4.2.0 < V4.2.5), SIPLUS ET 200SP IM 155-6 PN HF (6AG1155-6AU01-7CN0) (All versions >= V4.2.0 < V4.2.5), SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL (6AG2155-6AU01-1CN0) (All versions >= V4.2.0 < V4.2.5), SIPLUS ET 200SP IM 155-6 PN HF TX RAIL (6AG2155-6AU01-4CN0) (All versions >= V4.2.0 < V4.2.5), SIPLUS NET PN/PN Coupler (6AG2158-3AD10-4XA0) (All versions < V6.0.0). Affected devices do not properly handle S7 protocol session disconnect requests. When receiving a valid S7 protocol Disconnect Request (COTP DR TPDU) on TCP port 102, the devices enter an improper session state.\r\n\r\nThis could allow an attacker to cause the device to become unresponsive, leading to a denial-of-service condition that requires a power cycle to restore normal operation.",
      "affected": [
        {
          "vendor": "Siemens",
          "product": "SIMATIC ET 200AL IM 157-1 PN",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "*"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC ET 200MP IM 155-5 PN HF",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "V4.2.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "*"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC ET 200SP IM 155-6 MF HF",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "*"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants)",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "V1.3"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC ET 200SP IM 155-6 PN R1",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "V6.0.1"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC ET 200SP IM 155-6 PN/2 HF",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "V4.2.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "V4.2.5"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC ET 200SP IM 155-6 PN/3 HF",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "V4.2.2"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC PN/MF Coupler",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "*"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC PN/PN Coupler",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "V6.0.0"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIPLUS ET 200MP IM 155-5 PN HF",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "V4.2.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "*"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIPLUS ET 200MP IM 155-5 PN HF",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "V4.2.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "*"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "V4.2.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "*"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIPLUS ET 200SP IM 155-6 PN HF",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "V4.2.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "V4.2.5"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIPLUS ET 200SP IM 155-6 PN HF",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "V4.2.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "V4.2.5"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "V4.2.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "V4.2.5"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIPLUS ET 200SP IM 155-6 PN HF TX RAIL",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "V4.2.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "V4.2.5"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "SIPLUS NET PN/PN Coupler",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "V6.0.0"
            }
          ]
        }
      ]
    }
  }
}