CVE record · CVE-2025-40944

Uncontrolled resource consumption in Siemens SIMATIC ET 200AL IM 157-1 PN and others

CVSS 8.7 HighEPSS 0.0044 · 38th percentile

Published by the CVE Program (CNA: siemens) at 13 Jan 2026, 09:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Siemens	SIMATIC ET 200AL IM 157-1 PN	affected before * custom Other versions: unknown
Siemens	SIMATIC ET 200MP IM 155-5 PN HF	affected V4.2.0 to before * custom Other versions: unknown
Siemens	SIMATIC ET 200SP IM 155-6 MF HF	affected before * custom Other versions: unknown
Siemens	SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants)	affected before V1.3 custom Other versions: unknown
Siemens	SIMATIC ET 200SP IM 155-6 PN R1	affected before V6.0.1 custom Other versions: unknown
Siemens	SIMATIC ET 200SP IM 155-6 PN/2 HF	affected V4.2.0 to before V4.2.5 custom Other versions: unknown
Siemens	SIMATIC ET 200SP IM 155-6 PN/3 HF	affected before V4.2.2 custom Other versions: unknown
Siemens	SIMATIC PN/MF Coupler	affected before * custom Other versions: unknown
Siemens	SIMATIC PN/PN Coupler	affected before V6.0.0 custom Other versions: unknown
Siemens	SIPLUS ET 200MP IM 155-5 PN HF	affected V4.2.0 to before * custom Other versions: unknown
Siemens	SIPLUS ET 200MP IM 155-5 PN HF	affected V4.2.0 to before * custom Other versions: unknown
Siemens	SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL	affected V4.2.0 to before * custom Other versions: unknown
Siemens	SIPLUS ET 200SP IM 155-6 PN HF	affected V4.2.0 to before V4.2.5 custom Other versions: unknown
Siemens	SIPLUS ET 200SP IM 155-6 PN HF	affected V4.2.0 to before V4.2.5 custom Other versions: unknown
Siemens	SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL	affected V4.2.0 to before V4.2.5 custom Other versions: unknown
Siemens	SIPLUS ET 200SP IM 155-6 PN HF TX RAIL	affected V4.2.0 to before V4.2.5 custom Other versions: unknown
Siemens	SIPLUS NET PN/PN Coupler	affected before V6.0.0 custom Other versions: unknown

Identifiers: CVE-2025-40944
CNA: siemens
Weakness (CWE): CWE-400
Tags: Siemens SIMATIC ET 200AL IM 157-1 PN
Siemens SIMATIC ET 200MP IM 155-5 PN HF
Siemens SIMATIC ET 200SP IM 155-6 MF HF
Siemens SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants)
Siemens SIMATIC ET 200SP IM 155-6 PN R1
Siemens SIMATIC ET 200SP IM 155-6 PN/2 HF
Siemens SIMATIC ET 200SP IM 155-6 PN/3 HF
Siemens SIMATIC PN/MF Coupler
Denial of service
Published: 13 Jan 2026
Updated: 9 Jun 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (siemens)
8.7	High	4.0	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	CNA (siemens)Used for this record

CISA KEV Not listed.
EPSS 0.0044, the 38th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 13 Jan 2026. New records show when each source confirmed them.

Sources

References from the CNA

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

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.