CVE-2025-21225 Windows Remote Desktop Gateway (RD Gateway) Denial of Service Vulnerability
Attackers can cause a denial of service in Windows Remote Desktop Gateway, requiring administrators to apply Microsoft security patches.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-21225?
CVE-2025-21225 is a medium-severity denial of service vulnerability in Microsoft Windows Server 2016, published on 14 Jan 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Windows Remote Desktop Gateway (RD Gateway) Denial of Service Vulnerability
Weakness: CWE-843
Which versions are affected by CVE-2025-21225?
It affects 5 products.
Products include Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2022 23h2, Microsoft Windows Server 2025.
How do I fix CVE-2025-21225?
No fix has been published for CVE-2025-21225 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-21225 being exploited?
There is no known exploitation of CVE-2025-21225 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows Server 2016
- CVE-2021-34458 Windows Kernel Remote Code Execution Vulnerability
- CVE-2024-38076 Windows Remote Desktop Licensing Service Remote Code Execution Vulnerability
- CVE-2026-27928 Windows Hello Security Feature Bypass Vulnerability
- CVE-2025-27482 Windows Remote Desktop Services Remote Code Execution Vulnerability
- CVE-2024-49106 Windows Remote Desktop Services Remote Code Execution Vulnerability
Sources
Also known as GHSA-qgf5-w7jw-p449.