CVE-2025-49666
Windows Server Setup and Boot Event Collection Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Windows Server Setup and Boot Event Collection Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a network.
- Record
CVE-2025-49666- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-122
- Updated
- 2026-11-02
EUVDEUVD-2025-20578
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a network.
- Record
EUVD-2025-20578- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-jmhj-j4mm-pjj6
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a...
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a network.
- Record
GHSA-jmhj-j4mm-pjj6- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
NVD
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a network.
- Record
CVE-2025-49666- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
Affected products
- microsoft windows server 2016
- microsoft windows server 2016 (server core installation)
- microsoft windows server 2019
- microsoft windows server 2019 (server core installation)
- microsoft windows server 2022
- microsoft windows server 2022, 23h2 edition (server core installation)
- microsoft windows server 2025
- microsoft windows server 2025 (server core installation)
- microsoft windows server 2022 23h2
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | 17patmaks/My-Sigma-Rule-Collection | 2025-12-05 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-49666 is a high vulnerability (CVSS 7.2) in Microsoft Windows Server 2016, published July 8, 2025. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 1.42%, the 73rd percentile. No source names a fixed version.