Advisory Details

August 14th, 2025

(Pwn2Own) Microsoft Windows 11 vhdmp Integer Overflow Local Privilege Escalation Vulnerability

ZDI-25-841
ZDI-CAN-27235

CVE ID CVE-2025-53723
CVSS SCORE 8.8, AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the Virtual Hard Disk Miniport driver. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before allocating a buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53723
DISCLOSURE TIMELINE
  • 2025-05-23 - Vulnerability reported to vendor
  • 2025-08-14 - Coordinated public release of advisory
  • 2025-08-14 - Advisory Updated
CREDIT Chen Le Qi of STAR Labs SG Pte. Ltd.
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