# Uncontrolled resource consumption in Siemens SIMATIC ET 200AL IM 157-1 PN and others CVE record · `CVE-2025-40944` - **Identifiers:** `CVE-2025-40944` - **State:** Confirmed - **Severity:** CVSS 8.7 High - **Critical:** No - **CNA:** siemens - **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html) - **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md) - **Technologies:** [Siemens SIMATIC ET 200AL IM 157-1 PN](https://agentprime.io/advisories/technology/siemens-simatic-et-200al-im-157-1-pn.md) · [Siemens SIMATIC ET 200MP IM 155-5 PN HF](https://agentprime.io/advisories/technology/siemens-simatic-et-200mp-im-155-5-pn-hf.md) · [Siemens SIMATIC ET 200SP IM 155-6 MF HF](https://agentprime.io/advisories/technology/siemens-simatic-et-200sp-im-155-6-mf-hf.md) · [Siemens SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants)](https://agentprime.io/advisories/technology/siemens-simatic-et-200sp-im-155-6-pn-ha-incl-siplus-variants.md) · [Siemens SIMATIC ET 200SP IM 155-6 PN R1](https://agentprime.io/advisories/technology/siemens-simatic-et-200sp-im-155-6-pn-r1.md) · [Siemens SIMATIC ET 200SP IM 155-6 PN/2 HF](https://agentprime.io/advisories/technology/siemens-simatic-et-200sp-im-155-6-pn-2-hf.md) · [Siemens SIMATIC ET 200SP IM 155-6 PN/3 HF](https://agentprime.io/advisories/technology/siemens-simatic-et-200sp-im-155-6-pn-3-hf.md) · [Siemens SIMATIC PN/MF Coupler](https://agentprime.io/advisories/technology/siemens-simatic-pn-mf-coupler.md) · [Siemens SIMATIC PN/PN Coupler](https://agentprime.io/advisories/technology/siemens-simatic-pn-pn-coupler.md) · [Siemens SIPLUS ET 200MP IM 155-5 PN HF](https://agentprime.io/advisories/technology/siemens-siplus-et-200mp-im-155-5-pn-hf.md) · [Siemens SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL](https://agentprime.io/advisories/technology/siemens-siplus-et-200mp-im-155-5-pn-hf-t1-rail.md) · [Siemens SIPLUS ET 200SP IM 155-6 PN HF](https://agentprime.io/advisories/technology/siemens-siplus-et-200sp-im-155-6-pn-hf.md) · [Siemens SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL](https://agentprime.io/advisories/technology/siemens-siplus-et-200sp-im-155-6-pn-hf-t1-rail.md) · [Siemens SIPLUS ET 200SP IM 155-6 PN HF TX RAIL](https://agentprime.io/advisories/technology/siemens-siplus-et-200sp-im-155-6-pn-hf-tx-rail.md) · [Siemens SIPLUS NET PN/PN Coupler](https://agentprime.io/advisories/technology/siemens-siplus-net-pn-pn-coupler.md) - **Published:** 13 Jan 2026 - **Updated:** 9 Jun 2026 - **Reviewed by a person:** No 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: Siemens. Product: SIMATIC ET 200AL IM 157-1 PN. - affected: `before *` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIMATIC ET 200MP IM 155-5 PN HF. - affected: `V4.2.0 to before *` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIMATIC ET 200SP IM 155-6 MF HF. - affected: `before *` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants). - affected: `before V1.3` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIMATIC ET 200SP IM 155-6 PN R1. - affected: `before V6.0.1` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIMATIC ET 200SP IM 155-6 PN/2 HF. - affected: `V4.2.0 to before V4.2.5` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIMATIC ET 200SP IM 155-6 PN/3 HF. - affected: `before V4.2.2` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIMATIC PN/MF Coupler. - affected: `before *` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIMATIC PN/PN Coupler. - affected: `before V6.0.0` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIPLUS ET 200MP IM 155-5 PN HF. - affected: `V4.2.0 to before *` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIPLUS ET 200MP IM 155-5 PN HF. - affected: `V4.2.0 to before *` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL. - affected: `V4.2.0 to before *` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIPLUS ET 200SP IM 155-6 PN HF. - affected: `V4.2.0 to before V4.2.5` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIPLUS ET 200SP IM 155-6 PN HF. - affected: `V4.2.0 to before V4.2.5` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL. - affected: `V4.2.0 to before V4.2.5` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIPLUS ET 200SP IM 155-6 PN HF TX RAIL. - affected: `V4.2.0 to before V4.2.5` (custom) - Other versions: unknown - Vendor: Siemens. Product: SIPLUS NET PN/PN Coupler. - affected: `before V6.0.0` (custom) - Other versions: unknown ## 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 - 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (siemens) - 8.7 High, CVSS 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`, from 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 - [CVE List: CVE-2025-40944](https://www.cve.org/CVERecord?id=CVE-2025-40944) - [NVD: CVE-2025-40944](https://nvd.nist.gov/vuln/detail/CVE-2025-40944) ### References from the CNA - 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. ## Check whether this affects you This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run. - With the agentprime MCP server (), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: - As JSON: - Everything that needs attention now: --- The web page: . Everything for agents: .