CVE-2025-40820
Siemens · published 2025-12-09
Source record Collected from the National Vulnerability Database (NVD)
Description
Description by Siemens AG via the CVE Program.
Affected products do not properly enforce TCP sequence number validation in specific scenarios but accept values within a broad range. This could allow an unauthenticated remote attacker e.g. to interfere with connection setup, potentially leading to a denial of service. The attack succeeds only if an attacker can inject IP packets with spoofed addresses at precisely timed moments, and it affects only TCP-based services.
Status at the source
- NVD status: Deferred — NVD has not analysed this CVE.
Affected products, as the source lists them
| Vendor | Product | Versions |
|---|---|---|
| Siemens | SIDOOR ATD430W | 0 – before *: affected |
| Siemens | SIDOOR ATE530G COATED | 0 – before *: affected |
| Siemens | SIDOOR ATE530S COATED | 0 – before *: affected |
| Siemens | SIMATIC CFU DIQ | 0 – before V2.0.0: affected |
| Siemens | SIMATIC CFU PA | 0 – before V2.0.0: affected |
| Siemens | SIMATIC CFU PA | 0 – before V2.0.0: affected |
| Siemens | SIMATIC ET 200AL IM 157-1 PN | 0 – before *: affected |
| Siemens | SIMATIC ET 200clean, CM 8x IO-Link | 0 – before *: affected |
| Siemens | SIMATIC ET 200clean, DI 16x24VDC | 0 – before *: affected |
| Siemens | SIMATIC ET 200clean, DIQ 16x24VDC/0,5A | 0 – before *: affected |
| Siemens | SIMATIC ET 200eco PN, AI 8xRTD/TC, M12-L | V5.1.1 – before *: affected |
| Siemens | SIMATIC ET 200eco PN, CM 4x IO-Link, M12-L | V5.1.1 – before *: affected |
| Siemens | SIMATIC ET 200eco PN, CM 8x IO-Link, M12-L | V5.1.1 – before *: affected |
| Siemens | SIMATIC ET 200eco PN, CM 8x IO-Link, M12-L | V5.1.1 – before *: affected |
| Siemens | SIMATIC ET 200eco PN, DI 16x24VDC, M12-L | V5.1.1 – before *: affected |
| Siemens | SIMATIC ET 200eco PN, DI 8x24VDC, M12-L | V5.1.1 – before *: affected |
| Siemens | SIMATIC ET 200eco PN, DIQ 16x24VDC/2A, M12-L | V5.1.1 – before *: affected |
| Siemens | SIMATIC ET 200eco PN, DQ 8x24VDC/0,5A, M12-L | V5.1.1 – before *: affected |
| Siemens | SIMATIC ET 200eco PN, DQ 8x24VDC/2A, M12-L | V5.1.1 – before *: affected |
| Siemens | SIMATIC ET 200MP IM 155-5 PN HF | V4.2.0 – before *: affected |
| Siemens | SIMATIC ET 200pro IM 154-8 PN/DP CPU | 0 – before *: affected |
| Siemens | SIMATIC ET 200pro IM 154-8F PN/DP CPU | 0 – before *: affected |
| Siemens | SIMATIC ET 200pro IM 154-8FX PN/DP CPU | 0 – before *: affected |
| Siemens | SIMATIC ET 200S IM 151-8 PN/DP CPU | 0 – before *: affected |
| Siemens | SIMATIC ET 200S IM 151-8F PN/DP CPU | 0 – before *: affected |
| Siemens | SIMATIC ET 200SP CPU 1510SP F-1 PN | 0 – before *: affected |
| Siemens | SIMATIC ET 200SP CPU 1510SP-1 PN | 0 – before *: affected |
| Siemens | SIMATIC ET 200SP CPU 1512SP F-1 PN | 0 – before *: affected |
| Siemens | SIMATIC ET 200SP CPU 1512SP-1 PN | 0 – before *: affected |
| Siemens | SIMATIC ET 200SP IM 155-6 MF HF | 0 – before *: affected |
| Siemens | SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants) | 0 – before V1.3: affected |
| Siemens | SIMATIC ET 200SP IM 155-6 PN HF | V4.2.0 – before *: affected |
| Siemens | SIMATIC ET 200SP IM 155-6 PN/2 HF | V4.2.0 – before *: affected |
| Siemens | SIMATIC ET 200SP IM 155-6 PN/3 HF | V4.2.0 – before *: affected |
| Siemens | SIMATIC PN/MF Coupler | 0 – before *: affected |
| Siemens | SIMATIC PN/PN Coupler | 0 – before V6.0.0: affected |
| Siemens | SIMATIC Power Line Booster PLB, Base Module | 0 – before *: affected |
| Siemens | SIMATIC Power Line Booster PLB, Modem Module ST | 0 – before *: affected |
| Siemens | SIMATIC S7-1200 CPU 1211C AC/DC/Rly | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1211C DC/DC/DC | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1211C DC/DC/Rly | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1212C AC/DC/Rly | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1212C DC/DC/DC | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1212C DC/DC/Rly | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1212FC DC/DC/DC | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1212FC DC/DC/Rly | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1214C AC/DC/Rly | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1214C DC/DC/DC | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1214C DC/DC/Rly | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1214FC DC/DC/DC | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1214FC DC/DC/Rly | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1215C AC/DC/Rly | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1215C DC/DC/DC | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1215C DC/DC/Rly | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1215FC DC/DC/DC | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1215FC DC/DC/Rly | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1200 CPU 1217C DC/DC/DC | 0 – before V4.4.0: affected |
| Siemens | SIMATIC S7-1500 CPU 1511-1 PN | 0 – before *: affected |
| Siemens | SIMATIC S7-1500 CPU 1511F-1 PN | 0 – before *: affected |
| Siemens | SIMATIC S7-1500 CPU 1513-1 PN | 0 – before *: affected |
| Siemens | SIMATIC S7-1500 CPU 1513F-1 PN | 0 – before *: affected |
| Siemens | SIMATIC S7-1500 CPU 1515-2 PN | 0 – before *: affected |
| Siemens | SIMATIC S7-1500 CPU 1515F-2 PN | 0 – before *: affected |
| Siemens | SIMATIC S7-1500 CPU 1516-3 PN/DP | 0 – before *: affected |
| Siemens | SIMATIC S7-1500 CPU 1516F-3 PN/DP | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU CR40 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU CR60 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU SR20 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU SR20 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU SR30 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU SR30 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU SR40 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU SR40 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU SR60 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU SR60 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU ST20 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU ST20 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU ST30 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU ST30 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU ST40 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU ST40 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU ST60 | 0 – before *: affected |
| Siemens | SIMATIC S7-200 SMART CPU ST60 | 0 – before *: affected |
| Siemens | SIMATIC S7-300 CPU 314C-2 PN/DP | 0 – before *: affected |
| Siemens | SIMATIC S7-300 CPU 315-2 PN/DP | 0 – before *: affected |
| Siemens | SIMATIC S7-300 CPU 315F-2 PN/DP | 0 – before *: affected |
| Siemens | SIMATIC S7-300 CPU 315T-3 PN/DP | 0 – before *: affected |
| Siemens | SIMATIC S7-300 CPU 317-2 PN/DP | 0 – before *: affected |
| Siemens | SIMATIC S7-300 CPU 317F-2 PN/DP | 0 – before *: affected |
| Siemens | SIMATIC S7-300 CPU 317T-3 PN/DP | 0 – before *: affected |
| Siemens | SIMATIC S7-300 CPU 317TF-3 PN/DP | 0 – before *: affected |
| Siemens | SIMATIC S7-300 CPU 319-3 PN/DP | 0 – before *: affected |
| Siemens | SIMATIC S7-300 CPU 319F-3 PN/DP | 0 – before *: affected |
| Siemens | SIMATIC S7-400 CPU 412-2 PN V7 | 0 – before *: affected |
| Siemens | SIMATIC S7-400 CPU 414-3 PN/DP V7 | 0 – before *: affected |
| Siemens | SIMATIC S7-400 CPU 414F-3 PN/DP V7 | 0 – before *: affected |
| Siemens | SIMATIC S7-400 CPU 416-3 PN/DP V7 | 0 – before *: affected |
| Siemens | SIMATIC S7-400 CPU 416F-3 PN/DP V7 | 0 – before *: affected |
| Siemens | SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants) | 0 – before *: affected |
| Siemens | SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants) | 0 – before V10.2: affected |
The source lists more products than DeSpy shows; see the source record.
DeSpy has not checked any unit, hardware revision or firmware. A product missing here is not a statement that it is unaffected.
Scores, as their sources published them
- CVSS 4.0: 8.7 HIGH — as published by Siemens AG (Secondary)
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1: 7.5 HIGH — as published by Siemens AG (Secondary)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - SSVC — CISA's assessment (SSVC 2.0.3, CISA Coordinator): Exploitation: none · Automatable: yes · Technical impact: partial
DeSpy does not score records. These are the sources' own values.
Weaknesses
Sources
References the source lists
Source dates: published 2025-12-09, last changed 2026-10-07. DeSpy's copy of this version is dated 2026-10-07.
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