MSRC-CVE-2025-21225 — Windows Remote Desktop Gateway (RD Gateway) Denial of Service Vulnerability

Summary

Impact: Denial of Service. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.

Security updates
10.0.17763.6775 — https://support.microsoft.com/help/5050008
10.0.20348.3091 — https://support.microsoft.com/help/5049983
10.0.26100.2894 — https://support.microsoft.com/help/5050009
10.0.25398.1369 — https://support.microsoft.com/help/5049984
10.0.14393.7699 — https://support.microsoft.com/help/5049993

Vulnerabilities 1

Medium 5.9

CVE-2025-21225

Windows Remote Desktop Gateway (RD Gateway) Denial of Service Vulnerability

Windows Remote Desktop Gateway (RD Gateway) Denial of Service Vulnerability

Microsoft Windows Server 2019 Windows Server 2019 (Server Core installation) Windows Server 2022 Windows

Jan 14, 2025

Revision history

2025-01-14 #1
Updated acknowledgment. This is an informational change only.
2025-01-14 #2
Information published.

References

CVE-2025-21225 Windows Remote Desktop Gateway (RD Gateway) Denial of Service Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21225
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss