Description
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Windows Server 2016 | 10.0.14393.0 – < 10.0.14393.8246 | 10.0.14393.8246 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 – < 10.0.14393.8246 | 10.0.14393.8246 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – < 10.0.17763.7558 | 10.0.17763.7558 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 – < 10.0.17763.7558 | 10.0.17763.7558 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – < 10.0.20348.3932 | 10.0.20348.3932 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 – < 10.0.25398.1732 | 10.0.25398.1732 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – < 10.0.26100.4652 | 10.0.26100.4652 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – < 10.0.26100.4652 | 10.0.26100.4652 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
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17patmaks/My-Sigma-Rule-Collection ★ 0 · Dec 5, 2025
Sigma Rule for CVE-2025-49666
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- WID-SEC-2025-1495 Microsoft Windows: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 2, 2025
- NCSC-2025-0213 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Jul 8, 2025
- MSRC-CVE-2025-49666 Windows Server Setup and Boot Event Collection Remote Code Execution Vulnerability Microsoft Security Response Center · Jul 8, 2025
References
- Windows Server Setup and Boot Event Collection Remote Code Execution Vulnerability vendor-advisory patch