CVE-2025-40944 (GCVE-0-2025-40944)
Vulnerability from cvelistv5
Published
2026-01-13 09:44
Modified
2026-01-13 17:21
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-400 - Uncontrolled Resource Consumption
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), 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), SIPLUS ET 200SP IM 155-6 PN HF (6AG1155-6AU01-7CN0) (All versions >= V4.2.0), SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL (6AG2155-6AU01-1CN0) (All versions >= V4.2.0), SIPLUS ET 200SP IM 155-6 PN HF TX RAIL (6AG2155-6AU01-4CN0) (All versions >= V4.2.0), 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. This 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.
References
Impacted products
Vendor Product Version
Siemens SIMATIC ET 200AL IM 157-1 PN Version: 0   < *
 Create a notification for this product.
   Siemens SIMATIC ET 200MP IM 155-5 PN HF Version: V4.2.0   < *
 Create a notification for this product.
   Siemens SIMATIC ET 200SP IM 155-6 MF HF Version: 0   < *
 Create a notification for this product.
   Siemens SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants) Version: 0   < V1.3
 Create a notification for this product.
   Siemens SIMATIC ET 200SP IM 155-6 PN R1 Version: 0   < V6.0.1
 Create a notification for this product.
   Siemens SIMATIC ET 200SP IM 155-6 PN/2 HF Version: V4.2.0   < *
 Create a notification for this product.
   Siemens SIMATIC ET 200SP IM 155-6 PN/3 HF Version: 0   < V4.2.2
 Create a notification for this product.
   Siemens SIMATIC PN/MF Coupler Version: 0   < *
 Create a notification for this product.
   Siemens SIMATIC PN/PN Coupler Version: 0   < V6.0.0
 Create a notification for this product.
   Siemens SIPLUS ET 200MP IM 155-5 PN HF Version: V4.2.0   < *
 Create a notification for this product.
   Siemens SIPLUS ET 200MP IM 155-5 PN HF Version: V4.2.0   < *
 Create a notification for this product.
   Siemens SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL Version: V4.2.0   < *
 Create a notification for this product.
   Siemens SIPLUS ET 200SP IM 155-6 PN HF Version: V4.2.0   < *
 Create a notification for this product.
   Siemens SIPLUS ET 200SP IM 155-6 PN HF Version: V4.2.0   < *
 Create a notification for this product.
   Siemens SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL Version: V4.2.0   < *
 Create a notification for this product.
   Siemens SIPLUS ET 200SP IM 155-6 PN HF TX RAIL Version: V4.2.0   < *
 Create a notification for this product.
   Siemens SIPLUS NET PN/PN Coupler Version: 0   < V6.0.0
 Create a notification for this product.
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                "id": "CVE-2025-40944",
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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-40944\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-13T17:20:16.564311Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-13T17:21:33.216Z\"}}], \"cna\": {\"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"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\"}}, {\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 8.7, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N\"}}], \"affected\": [{\"vendor\": \"Siemens\", \"product\": \"SIMATIC ET 200AL IM 157-1 PN\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC ET 200MP IM 155-5 PN HF\", \"versions\": [{\"status\": \"affected\", \"version\": \"V4.2.0\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC ET 200SP IM 155-6 MF HF\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC ET 200SP IM 155-6 PN HA (incl. 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SIPLUS variants) (All versions \u003c V1.3), SIMATIC ET 200SP IM 155-6 PN R1 (6ES7155-6AU00-0HM0) (All versions \u003c V6.0.1), SIMATIC ET 200SP IM 155-6 PN/2 HF (6ES7155-6AU01-0CN0) (All versions \u003e= V4.2.0), SIMATIC ET 200SP IM 155-6 PN/3 HF (6ES7155-6AU30-0CN0) (All versions \u003c V4.2.2), SIMATIC PN/MF Coupler (6ES7158-3MU10-0XA0) (All versions), SIMATIC PN/PN Coupler (6ES7158-3AD10-0XA0) (All versions \u003c V6.0.0), SIPLUS ET 200MP IM 155-5 PN HF (6AG1155-5AA00-2AC0) (All versions \u003e= V4.2.0), SIPLUS ET 200MP IM 155-5 PN HF (6AG1155-5AA00-7AC0) (All versions \u003e= V4.2.0), SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL (6AG2155-5AA00-1AC0) (All versions \u003e= V4.2.0), SIPLUS ET 200SP IM 155-6 PN HF (6AG1155-6AU01-2CN0) (All versions \u003e= V4.2.0), SIPLUS ET 200SP IM 155-6 PN HF (6AG1155-6AU01-7CN0) (All versions \u003e= V4.2.0), SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL (6AG2155-6AU01-1CN0) (All versions \u003e= V4.2.0), SIPLUS ET 200SP IM 155-6 PN HF TX RAIL (6AG2155-6AU01-4CN0) (All versions \u003e= V4.2.0), SIPLUS NET PN/PN Coupler (6AG2158-3AD10-4XA0) (All versions \u003c 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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400: Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"cec7a2ec-15b4-4faf-bd53-b40f371f3a77\", \"shortName\": \"siemens\", \"dateUpdated\": \"2026-01-13T09:44:05.792Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-40944\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-13T17:21:36.848Z\", \"dateReserved\": \"2025-04-16T09:06:15.879Z\", \"assignerOrgId\": \"cec7a2ec-15b4-4faf-bd53-b40f371f3a77\", \"datePublished\": \"2026-01-13T09:44:05.792Z\", \"assignerShortName\": \"siemens\"}",
      "dataType": "CVE_RECORD",
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    }
  }
}


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  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.