CVE-2025-40944_CVE-2025-40944

7.5 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

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.

Basic Information

ID CVE-2025-40944

Source siemens

Published Jan 13, 2026 at 09:44

Affected Product

Vendor Siemens

Product SIMATIC ET 200AL IM 157-1 PN

Affected Versions Siemens SIMATIC ET 200AL IM 157-1 PN 0
Siemens SIMATIC ET 200MP IM 155-5 PN HF V4.2.0
Siemens SIMATIC ET 200SP IM 155-6 MF HF 0
Siemens SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants) 0
Siemens SIMATIC ET 200SP IM 155-6 PN R1 0
Siemens SIMATIC ET 200SP IM 155-6 PN/2 HF V4.2.0
Siemens SIMATIC ET 200SP IM 155-6 PN/3 HF 0
Siemens SIMATIC PN/MF Coupler 0
Siemens SIMATIC PN/PN Coupler 0
Siemens SIPLUS ET 200MP IM 155-5 PN HF V4.2.0
Siemens SIPLUS ET 200MP IM 155-5 PN HF V4.2.0
Siemens SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL V4.2.0
Siemens SIPLUS ET 200SP IM 155-6 PN HF V4.2.0
Siemens SIPLUS ET 200SP IM 155-6 PN HF V4.2.0
Siemens SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL V4.2.0
Siemens SIPLUS ET 200SP IM 155-6 PN HF TX RAIL V4.2.0
Siemens SIPLUS NET PN/PN Coupler 0

CWE Classification

CWE-400

References

cert-portal.siemens.com /productcert/html/ssa-674753.html

{
    "lastseen": "",
    "description": "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.\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.",
    "published": "2026-01-13T09:44:05.792Z",
    "modified": "2026-01-13T09:44:05.792Z",
    "type": "cve",
    "title": "CVE-2025-40944",
    "source": "siemens",
    "references": "https://cert-portal.siemens.com/productcert/html/ssa-674753.html",
    "id": "CVE-2025-40944",
    "bulletinFamily": "",
    "cwe": [
        "CWE-400"
    ],
    "cvelist": null,
    "sourceData": "Siemens SIMATIC ET 200AL IM 157-1 PN 0\nSiemens SIMATIC ET 200MP IM 155-5 PN HF V4.2.0\nSiemens SIMATIC ET 200SP IM 155-6 MF HF 0\nSiemens SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants) 0\nSiemens SIMATIC ET 200SP IM 155-6 PN R1 0\nSiemens SIMATIC ET 200SP IM 155-6 PN/2 HF V4.2.0\nSiemens SIMATIC ET 200SP IM 155-6 PN/3 HF 0\nSiemens SIMATIC PN/MF Coupler 0\nSiemens SIMATIC PN/PN Coupler 0\nSiemens SIPLUS ET 200MP IM 155-5 PN HF V4.2.0\nSiemens SIPLUS ET 200MP IM 155-5 PN HF V4.2.0\nSiemens SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL V4.2.0\nSiemens SIPLUS ET 200SP IM 155-6 PN HF V4.2.0\nSiemens SIPLUS ET 200SP IM 155-6 PN HF V4.2.0\nSiemens SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL V4.2.0\nSiemens SIPLUS ET 200SP IM 155-6 PN HF TX RAIL V4.2.0\nSiemens SIPLUS NET PN/PN Coupler 0",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "SIMATIC ET 200AL IM 157-1 PN",
    "version": "0",
    "vendor": "Siemens",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}