CVE-2025-40820 
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.
Problem types: cwe_id: CWE-940
description: CWE-940: Improper Verification of Source of a Communication Channel
Affected products: vendor: Siemens
product: SIDOOR ATD430W
default_status: unknown
vendor: Siemens
product: SIDOOR ATE530G COATED
default_status: unknown
vendor: Siemens
product: SIDOOR ATE530S COATED
default_status: unknown
vendor: Siemens
product: SIMATIC CFU DIQ
default_status: unknown
vendor: Siemens
product: SIMATIC CFU PA
default_status: unknown
vendor: Siemens
product: SIMATIC CFU PA
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200AL IM 157-1 PN
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200clean, CM 8x IO-Link
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200clean, DI 16x24VDC
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200clean, DIQ 16x24VDC/0,5A
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200eco PN, AI 8xRTD/TC, M12-L
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200eco PN, CM 4x IO-Link, M12-L
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200eco PN, CM 8x IO-Link, M12-L
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200eco PN, CM 8x IO-Link, M12-L
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200eco PN, DI 16x24VDC, M12-L
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200eco PN, DI 8x24VDC, M12-L
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200eco PN, DIQ 16x24VDC/2A, M12-L
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200eco PN, DQ 8x24VDC/0,5A, M12-L
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200eco PN, DQ 8x24VDC/2A, M12-L
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200MP IM 155-5 PN HF
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200pro IM 154-8 PN/DP CPU
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200pro IM 154-8F PN/DP CPU
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200pro IM 154-8FX PN/DP CPU
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200S IM 151-8 PN/DP CPU
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200S IM 151-8F PN/DP CPU
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200SP CPU 1510SP F-1 PN
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200SP CPU 1510SP-1 PN
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200SP CPU 1512SP F-1 PN
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200SP CPU 1512SP-1 PN
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200SP IM 155-6 MF HF
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants)
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200SP IM 155-6 PN HF
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200SP IM 155-6 PN/2 HF
default_status: unknown
vendor: Siemens
product: SIMATIC ET 200SP IM 155-6 PN/3 HF
default_status: unknown
vendor: Siemens
product: SIMATIC PN/MF Coupler
default_status: unknown
vendor: Siemens
product: SIMATIC PN/PN Coupler
default_status: unknown
vendor: Siemens
product: SIMATIC Power Line Booster PLB, Base Module
default_status: unknown
vendor: Siemens
product: SIMATIC Power Line Booster PLB, Modem Module ST
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1211C AC/DC/Rly
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1211C DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1211C DC/DC/Rly
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1212C AC/DC/Rly
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1212C DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1212C DC/DC/Rly
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1212FC DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1212FC DC/DC/Rly
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1214C AC/DC/Rly
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1214C DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1214C DC/DC/Rly
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1214FC DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1214FC DC/DC/Rly
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1215C AC/DC/Rly
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1215C DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1215C DC/DC/Rly
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1215FC DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1215FC DC/DC/Rly
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1200 CPU 1217C DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1500 CPU 1511-1 PN
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1500 CPU 1511F-1 PN
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1500 CPU 1513-1 PN
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1500 CPU 1513F-1 PN
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1500 CPU 1515-2 PN
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1500 CPU 1515F-2 PN
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1500 CPU 1516-3 PN/DP
default_status: unknown
vendor: Siemens
product: SIMATIC S7-1500 CPU 1516F-3 PN/DP
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU CR40
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU CR60
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU SR20
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU SR20
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU SR30
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU SR30
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU SR40
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU SR40
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU SR60
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU SR60
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU ST20
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU ST20
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU ST30
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU ST30
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU ST40
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU ST40
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU ST60
default_status: unknown
vendor: Siemens
product: SIMATIC S7-200 SMART CPU ST60
default_status: unknown
vendor: Siemens
product: SIMATIC S7-300 CPU 314C-2 PN/DP
default_status: unknown
vendor: Siemens
product: SIMATIC S7-300 CPU 315-2 PN/DP
default_status: unknown
vendor: Siemens
product: SIMATIC S7-300 CPU 315F-2 PN/DP
default_status: unknown
vendor: Siemens
product: SIMATIC S7-300 CPU 315T-3 PN/DP
default_status: unknown
vendor: Siemens
product: SIMATIC S7-300 CPU 317-2 PN/DP
default_status: unknown
vendor: Siemens
product: SIMATIC S7-300 CPU 317F-2 PN/DP
default_status: unknown
vendor: Siemens
product: SIMATIC S7-300 CPU 317T-3 PN/DP
default_status: unknown
vendor: Siemens
product: SIMATIC S7-300 CPU 317TF-3 PN/DP
default_status: unknown
vendor: Siemens
product: SIMATIC S7-300 CPU 319-3 PN/DP
default_status: unknown
vendor: Siemens
product: SIMATIC S7-300 CPU 319F-3 PN/DP
default_status: unknown
vendor: Siemens
product: SIMATIC S7-400 CPU 412-2 PN V7
default_status: unknown
vendor: Siemens
product: SIMATIC S7-400 CPU 414-3 PN/DP V7
default_status: unknown
vendor: Siemens
product: SIMATIC S7-400 CPU 414F-3 PN/DP V7
default_status: unknown
vendor: Siemens
product: SIMATIC S7-400 CPU 416-3 PN/DP V7
default_status: unknown
vendor: Siemens
product: SIMATIC S7-400 CPU 416F-3 PN/DP V7
default_status: unknown
vendor: Siemens
product: SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants)
default_status: unknown
vendor: Siemens
product: SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants)
default_status: unknown
vendor: Siemens
product: SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants)
default_status: unknown
vendor: Siemens
product: SIMATIC TDC CP51M1
default_status: unknown
vendor: Siemens
product: SIMATIC TDC CPU555
default_status: unknown
vendor: Siemens
product: SIMOCODE pro V Ethernet/IP (incl. SIPLUS variants)
default_status: unknown
vendor: Siemens
product: SIMOCODE pro V PROFINET
default_status: unknown
vendor: Siemens
product: SINUMERIK 840D sl
default_status: unknown
vendor: Siemens
product: SIPLUS ET 200MP IM 155-5 PN HF
default_status: unknown
vendor: Siemens
product: SIPLUS ET 200MP IM 155-5 PN HF
default_status: unknown
vendor: Siemens
product: SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL
default_status: unknown
vendor: Siemens
product: SIPLUS ET 200S IM 151-8 PN/DP CPU
default_status: unknown
vendor: Siemens
product: SIPLUS ET 200S IM 151-8F PN/DP CPU
default_status: unknown
vendor: Siemens
product: SIPLUS ET 200SP CPU 1512SP F-1 PN
default_status: unknown
vendor: Siemens
product: SIPLUS ET 200SP IM 155-6 PN HF
default_status: unknown
vendor: Siemens
product: SIPLUS ET 200SP IM 155-6 PN HF
default_status: unknown
vendor: Siemens
product: SIPLUS ET 200SP IM 155-6 PN HF
default_status: unknown
vendor: Siemens
product: SIPLUS ET 200SP IM 155-6 PN HF
default_status: unknown
vendor: Siemens
product: SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL
default_status: unknown
vendor: Siemens
product: SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL
default_status: unknown
vendor: Siemens
product: SIPLUS ET 200SP IM 155-6 PN HF TX RAIL
default_status: unknown
vendor: Siemens
product: SIPLUS HCS4200 CIM4210
default_status: unknown
vendor: Siemens
product: SIPLUS HCS4200 CIM4210C
default_status: unknown
vendor: Siemens
product: SIPLUS HCS4300 CIM4310
default_status: unknown
vendor: Siemens
product: SIPLUS NET PN/PN Coupler
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1212 AC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1212 DC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1212 DC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1212C AC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1212C DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1212C DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1212C DC/DC/DC RAIL
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1214 AC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1214 DC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1214C AC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1214C AC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1214C DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1214C DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1214C DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1214C DC/DC/DC RAIL
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1214C DC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1214C DC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1214FC DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1214FC DC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1215 AC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1215 AC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1215 DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1215 DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1215 DC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1215 DC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1215 DC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1215C AC/DC/RLY
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1215C DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1200 CPU 1215FC DC/DC/DC
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1500 CPU 1511-1 PN
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1500 CPU 1511F-1 PN
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1500 CPU 1513-1 PN
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1500 CPU 1513F-1 PN
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1500 CPU 1516-3 PN/DP
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1500 CPU 1516-3 PN/DP
default_status: unknown
vendor: Siemens
product: SIPLUS S7-1500 CPU 1516F-3 PN/DP
default_status: unknown
vendor: Siemens
product: SIPLUS S7-300 CPU 314C-2 PN/DP
default_status: unknown
vendor: Siemens
product: SIPLUS S7-300 CPU 315-2 PN/DP
default_status: unknown
vendor: Siemens
product: SIPLUS S7-300 CPU 315F-2 PN/DP
default_status: unknown
vendor: Siemens
product: SIPLUS S7-300 CPU 317-2 PN/DP
default_status: unknown
vendor: Siemens
product: SIPLUS S7-300 CPU 317F-2 PN/DP
default_status: unknown
vendor: Siemens
product: SIPLUS S7-400 CPU 414-3 PN/DP V7
default_status: unknown
vendor: Siemens
product: SIPLUS S7-400 CPU 416-3 PN/DP V7
default_status: unknown
vendor: Siemens
product: SIWAREX WP231
default_status: unknown
vendor: Siemens
product: SIWAREX WP241
default_status: unknown
vendor: Siemens
product: SIWAREX WP251
default_status: unknown
vendor: Siemens
product: SIWAREX WP521 ST
default_status: unknown
vendor: Siemens
product: SIWAREX WP522 ST
default_status: unknown
CVSS v3.1: version: 3.1
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
baseScore: 7.5
baseSeverity: HIGH
Published: 2025-12-09T10:44:30.977Z