CVE-2025-40820
HIGH EPSS 33.4%
Published Dec 9, 20256mo ago · Modified Jun 17, 20261w ago
8.7 CVSS 4.0
Published Dec 9, 2025 6mo ago
Last Modified Jun 17, 2026 1w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
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 Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
33.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-940
References 1
- cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-915282.html
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.