Heap-Based Buffer Overflow in Windows Kernel Affects Microsoft Products
CVE-2025-49666

7.2HIGH

Key Information:

Vendor

Microsoft
Status
Windows Server 2019
Windows Server 2019 (server Core Installation)
Windows Server 2022
Windows Server 2025 (server Core Installation)
Vendor
CVE Published:
8 July 2025

What is CVE-2025-49666?

A heap-based buffer overflow vulnerability exists in the Windows Kernel, allowing an authorized attacker to exploit the flaw to execute arbitrary code remotely over a network. Successful exploitation may result in unauthorized control over the affected system, potentially leading to data compromise or system disruption.

Affected Version(s)

Windows Server 2016 (Server Core installation) x64-based Systems 10.0.14393.0 < 10.0.14393.8246

Windows Server 2016 x64-based Systems 10.0.14393.0 < 10.0.14393.8246

Windows Server 2019 (Server Core installation) x64-based Systems 10.0.17763.0 < 10.0.17763.7558

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisory

CVSS V3.1

Score:
7.2
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-49666 : Heap-Based Buffer Overflow in Windows Kernel Affects Microsoft Products