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CVE-2025-40944

Quick assessment

Affected
Siemens SIMATIC ET 200AL IM 157-1 PN
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Siemens SIMATIC ET 200AL等都是德国西门子（Siemens）公司的产品。Siemens SIMATIC ET 200AL是一款分布式I/O系统模块。Siemens SIMATIC ET 200MP是一款用于高密度通道应用的控制柜的模块化I/O系统模块。Siemens SIMATIC ET 200SP是一款分布式I/O系统。 Siemens多款产品存在资源管理错误漏洞，该漏洞源于S7协议会话断开请求处理不当，可能导致设备无响应和拒绝服务。以下产品及版本受到影响：SIMATIC ET 2

CVSS 7.5 · High EPSS 0.40% · P33

Affected Version Matrix 17

VendorProduct Version RangeStatus
Siemens SIMATIC ET 200AL IM 157-1 PN < * affected
Siemens SIMATIC ET 200MP IM 155-5 PN HF V4.2.0< * affected
Siemens SIMATIC ET 200SP IM 155-6 MF HF < * affected
Siemens SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants) < V1.3 affected
Siemens SIMATIC ET 200SP IM 155-6 PN R1 < V6.0.1 affected
Siemens SIMATIC ET 200SP IM 155-6 PN/2 HF V4.2.0< V4.2.5 affected
Siemens SIMATIC ET 200SP IM 155-6 PN/3 HF < V4.2.2 affected
Siemens SIMATIC PN/MF Coupler < * affected
Siemens SIMATIC PN/PN Coupler < V6.0.0 affected
Siemens SIPLUS ET 200MP IM 155-5 PN HF V4.2.0< * affected
V4.2.0< * affected
Siemens SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL V4.2.0< * affected
Siemens SIPLUS ET 200SP IM 155-6 PN HF V4.2.0< V4.2.5 affected
V4.2.0< V4.2.5 affected
Siemens SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL V4.2.0< V4.2.5 affected
Siemens SIPLUS ET 200SP IM 155-6 PN HF TX RAIL V4.2.0< V4.2.5 affected
Siemens SIPLUS NET PN/PN Coupler < V6.0.0 affected
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I. Basic Information for CVE-2025-40944

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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 < 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. 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Siemens多款产品 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Siemens SIMATIC ET 200AL等都是德国西门子（Siemens）公司的产品。Siemens SIMATIC ET 200AL是一款分布式I/O系统模块。Siemens SIMATIC ET 200MP是一款用于高密度通道应用的控制柜的模块化I/O系统模块。Siemens SIMATIC ET 200SP是一款分布式I/O系统。 Siemens多款产品存在资源管理错误漏洞，该漏洞源于S7协议会话断开请求处理不当，可能导致设备无响应和拒绝服务。以下产品及版本受到影响：SIMATIC ET 2
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
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 ~ V1.3 -
Siemens SIMATIC ET 200SP IM 155-6 PN R1 0 ~ V6.0.1 -
Siemens SIMATIC ET 200SP IM 155-6 PN/2 HF V4.2.0 ~ V4.2.5 -
Siemens SIMATIC ET 200SP IM 155-6 PN/3 HF 0 ~ V4.2.2 -
Siemens SIMATIC PN/MF Coupler 0 ~ * -
Siemens SIMATIC PN/PN Coupler 0 ~ V6.0.0 -
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 ~ V4.2.5 -
Siemens SIPLUS ET 200SP IM 155-6 PN HF V4.2.0 ~ V4.2.5 -
Siemens SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL V4.2.0 ~ V4.2.5 -
Siemens SIPLUS ET 200SP IM 155-6 PN HF TX RAIL V4.2.0 ~ V4.2.5 -
Siemens SIPLUS NET PN/PN Coupler 0 ~ V6.0.0 -

II. Public POCs for CVE-2025-40944

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III. Intelligence Information for CVE-2025-40944

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Vendor Advisories for CVE-2025-40944 (1)

Same Patch Batch · Siemens · 2026-01-13 · 3 CVEs total

CVE-2025-40805 10.0 CRITICAL Siemens Industrial Edge Devices 安全漏洞
CVE-2025-40942 8.8 HIGH siemens TeleControl Server Basic 安全漏洞

IV. Related Vulnerabilities

Same vendor: Siemens
Same weakness: CWE-400

V. Comments for CVE-2025-40944

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