CVE Tools
Sign in

CVE-2025-40944

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 20...

Published: Jan 13, 2026Updated: Jun 9, 2026 Sources: CVE List NVD csafCWE-400
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.4%
Top 68.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Siemens ET 200 devices contain a denial-of-service vulnerability that could be triggered by sending a valid S7 protocol Disconnect Request (COTP DR TPDU), causing the device to become unresponsive and require a power cycle to recover. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix versions and recommends specific countermeasures for products where fixes are not, or not yet available.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-400

Affected Products

SIMATIC ET 200AL IM 157-1 PNSiemensICS / OT / IoT
SIMATIC ET 200MP IM 155-5 PN HFSiemensICS / OT / IoT
SIMATIC ET 200SP IM 155-6 MF HFSiemensICS / OT / IoT
SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants)SiemensICS / OT / IoT
SIMATIC ET 200SP IM 155-6 PN R1SiemensICS / OT / IoT
siemenscommercialDEEnterprise Softwareaka siemens ag
and 10 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://cert-portal.siemens.com/productcert/csaf/ssa-674753.json
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-674753.html
cert-portal.siemens.com
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-015-04.json
raw.githubusercontent.com
and 10 more references View all →

Timeline

Published
Jan 13, 2026
Last Updated
Jun 9, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2025-40944 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows