CVE-2025-49666 Windows Server Setup and Boot Event Collection Remote Code Execution Vulnerability
An authorized attacker can execute code remotely via a heap-based buffer overflow in the Windows Kernel.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-49666?
CVE-2025-49666 is a high-severity memory corruption vulnerability in Microsoft Windows Server 2016, published on 8 Jul 2025. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a network.
Weakness: CWE-122
Which versions are affected by CVE-2025-49666?
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-2025-49666?
No fix has been published for CVE-2025-49666 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-49666 being exploited?
There is no known exploitation of CVE-2025-49666 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
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-jmhj-j4mm-pjj6.