CVE-2025-49666
Published: 08 July 2025
Summary
CVE-2025-49666 is a high-severity Heap-based Buffer Overflow (CWE-122) vulnerability in Microsoft Windows Server 2016. Its CVSS base score is 7.2 (High).
Operationally, ranked in the top 15.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2025-49666 is a heap-based buffer overflow vulnerability, tracked under CWE-122, that affects the Windows Kernel. The flaw carries a CVSS 3.1 base score of 7.2 and permits remote code execution when triggered by an authenticated user.
An attacker with high privileges can send specially crafted network traffic to a vulnerable system and achieve arbitrary code execution with full control over confidentiality, integrity, and availability. No user interaction is required once network access and the necessary privileges are obtained.
Microsoft’s advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49666 supplies the official patch information and recommended mitigation steps. The associated EPSS score remains low at 0.0219 with no material increase since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-20578
Vulnerability details
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a network.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.