Heap-Based Buffer Overflow in Windows Win32K by Microsoft
CVE-2025-49727

7HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1809
Windows Server 2019
Windows Server 2019 (server Core Installation)
Windows Server 2022
Vendor
CVE Published:
8 July 2025

What is CVE-2025-49727?

A heap-based buffer overflow vulnerability in Microsoft Windows Win32K component permits an authorized attacker to exploit this weakness to elevate privileges on the affected system. By carefully crafting requests, an attacker could gain higher access rights, which could lead to unauthorized actions or system control.

Affected Version(s)

Windows 10 Version 1507 32-bit Systems 10.0.10240.0 < 10.0.10240.21073

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.8246

Windows 10 Version 1809 32-bit 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
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-49727 : Heap-Based Buffer Overflow in Windows Win32K by Microsoft