CVE-2025-21309 Windows Remote Desktop Services Remote Code Execution Vulnerability
Attackers can execute arbitrary code on Windows Server systems via Remote Desktop Services, requiring immediate patching.
- 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-2025-21309?
CVE-2025-21309 is a high-severity code injection vulnerability in Microsoft Windows Server 2012, 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 Services Remote Code Execution Vulnerability
Weakness: CWE-591
Which versions are affected by CVE-2025-21309?
It affects 6 products.
Products include Microsoft Windows Server 2012, 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-2025-21309?
No fix has been published for CVE-2025-21309 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2025-21309 being exploited?
There is no known exploitation of CVE-2025-21309 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows Server 2012
- CVE-2025-59287 Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data
- CVE-2026-69595 Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
- CVE-2026-78445 Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
- CVE-2026-41089 Windows Netlogon Remote Code Execution Vulnerability
- CVE-2024-43639 Windows KDC Proxy Remote Code Execution Vulnerability
Sources
Also known as GHSA-cwpx-vh5m-58gx.