CVE-2026-56181

HIGH

Microsoft Windows 11 Version 24H2 - Windows Network Address Translation (NAT) Spoofing Vulnerability

Title source: rule
STIX 2.1

Description

Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Windows Network Address Translation (NAT) Spoofing Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56181

Scores

CVSS v3 8.3
EPSS 0.0024
EPSS Percentile 14.9%
Attack Vector ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-346
Status published
Products (10)
Microsoft/Windows 11 Version 24H2 10.0.26100.0 - 10.0.26100.8875
Microsoft/Windows 11 Version 25H2 10.0.26200.0 - 10.0.26100.8875
Microsoft/Windows 11 Version 25H2 10.0.26200.0 - 10.0.26200.8875
Microsoft/Windows 11 version 26H1 10.0.28000.0 - 10.0.28000.2525
Microsoft/Windows Server 2025 10.0.26100.0 - 10.0.26100.33158
Microsoft/Windows Server 2025 (Server Core installation) 10.0.26100.0 - 10.0.26100.33158
microsoft/windows_11_24h2 < 10.0.26100.8875
microsoft/windows_11_25h2 < 10.0.26200.8875
microsoft/windows_11_26h1 < 10.0.28000.2525
microsoft/windows_server_2025 < 10.0.26100.33158
Published Jul 14, 2026
Tracked Since Jul 14, 2026