CVE-2025-50171: Remote Desktop Spoofing Vulnerability

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-08-12 · updated 2026-06-17
Weakness: CWE-862

Description

Missing authorization in Remote Desktop Server allows an unauthorized attacker to perform spoofing over a network.

Affected products

Microsoft Windows Server 2022: before 10.0.20348.3989 — fixed in 10.0.20348.3989
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1791 — fixed in 10.0.25398.1791
Microsoft Windows Server 2025: before 10.0.26100.4851 — fixed in 10.0.26100.4851
Microsoft Windows 10: from 10.0.19044.0 before 10.0.19044.6216 — fixed in 10.0.19044.6216
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.6216 — fixed in 10.0.19045.6216
Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.5768 — fixed in 10.0.22621.5768
Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.5768 — fixed in 10.0.22631.5768
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.5768 — fixed in 10.0.22631.5768
Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.4946 — fixed in 10.0.26100.4946
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.4052 — fixed in 10.0.20348.4052
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.1791 — fixed in 10.0.25398.1791
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.4946 — fixed in 10.0.26100.4946

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2022 10.0.20348.3989; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1791; Microsoft Windows Server 2025 10.0.26100.4851; Microsoft Windows 10 10.0.19044.6216; Microsoft Windows 10 10.0.19045.6216; Microsoft Windows 11 10.0.22621.5768; Microsoft Windows 11 version 22H3 10.0.22631.5768; Microsoft Windows 11 10.0.22631.5768; Microsoft Windows 11 10.0.26100.4946; Microsoft Windows Server 2022 10.0.20348.4052; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1791; Microsoft Windows Server 2025 10.0.26100.4946. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-50171

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