Description
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.
References (1)
Core 1
Core References
Vendor Advisory
https://cert-portal.siemens.com/productcert/html/ssa-915282.html
Scores
CVSS v3
7.5
EPSS
0.0010
EPSS Percentile
27.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-940
Status
published
Products (50)
Siemens/SIDOOR ATD430W
Siemens/SIDOOR ATE530G COATED
Siemens/SIDOOR ATE530S COATED
Siemens/SIMATIC CFU DIQ
< V2.0.0
Siemens/SIMATIC CFU PA
< V2.0.0
Siemens/SIMATIC ET 200AL IM 157-1 PN
Siemens/SIMATIC ET 200clean, CM 8x IO-Link
Siemens/SIMATIC ET 200clean, DI 16x24VDC
Siemens/SIMATIC ET 200clean, DIQ 16x24VDC/0,5A
Siemens/SIMATIC ET 200eco PN, AI 8xRTD/TC, M12-L
V5.1.1
... and 40 more
Published
Dec 09, 2025
Tracked Since
Feb 18, 2026