CVE-2025-53725: Windows 10 1507 Privilege Escalation Flaw

CVE-2025-53725 Overview

CVE-2025-53725 is a type confusion vulnerability in the Windows Push Notifications component. An authorized local attacker can exploit incompatible type access to elevate privileges on affected Windows systems. The flaw is tracked under CWE-843: Access of Resource Using Incompatible Type and affects both client and server editions of Windows across a wide range of supported versions.

Successful exploitation grants the attacker elevated privileges with high impact to confidentiality, integrity, and availability on the local host. Microsoft published the advisory on August 12, 2025 through the Microsoft Security Response Center.

Critical Impact
A low-privileged local user can escalate to SYSTEM-level privileges by triggering a type confusion condition in Windows Push Notifications, resulting in full control of the compromised host.

Affected Products

Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
Microsoft Windows 11 (versions 22H2, 23H2, 24H2)
Microsoft Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2022 23H2, and 2025

Discovery Timeline

2025-08-12 - CVE-2025-53725 published to NVD and Microsoft released the security update
2026-06-17 - Last updated in the NVD database

Technical Details for CVE-2025-53725

Vulnerability Analysis

The vulnerability resides in the Windows Push Notifications service, which delivers toast and background notifications to applications. The component accesses a resource using an incompatible type, leading to a type confusion condition. When exploited, the operating system operates on memory as if it were a different object type than what was actually allocated.

Type confusion issues in Windows kernel-adjacent services frequently allow attackers to reinterpret pointer or object fields, corrupting internal state. An attacker with authenticated local access can craft an interaction that steers the vulnerable code path into treating attacker-controlled data as a trusted structure. The result is arbitrary elevation of privilege within the local security context.

The issue requires no user interaction and can be triggered from a low-privilege session, making it attractive as a post-compromise stepping stone during intrusion chains.

Root Cause

The root cause is improper type validation before dereferencing or invoking methods on an object handled by the Windows Push Notifications subsystem [CWE-843]. Because the code does not verify the runtime type of the accessed resource, an object of one type is manipulated as another, corrupting execution flow or memory state.

Attack Vector

Exploitation requires local access and low privileges on the target system. The attacker runs code as a standard user, interacts with the Push Notifications service through its exposed interfaces, and supplies input that triggers the type confusion. Successful exploitation yields code execution with elevated privileges, typically SYSTEM.

No public proof-of-concept exploit code is available at this time, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. See the Microsoft Security Update Guide for vendor-supplied technical details.

Detection Methods for CVE-2025-53725

Indicators of Compromise

Unexpected child processes spawned by WpnUserService.dll-hosted service instances or svchost.exe instances running the Push Notifications service.
Creation of new local accounts, service installations, or scheduled tasks shortly after anomalous activity involving the Push Notifications service.
Standard user sessions performing actions that require SYSTEM privileges without a corresponding legitimate elevation event.

Detection Strategies

Monitor process ancestry for svchost.exe instances hosting WpnUserService and alert when they spawn shells, cmd.exe, powershell.exe, or other interactive processes.
Correlate abnormal token privilege changes (SeDebugPrivilege, SeImpersonatePrivilege) originating from user contexts that recently interacted with the Push Notifications API.
Deploy behavioral detections for local privilege escalation patterns, such as low-integrity processes writing to protected paths or modifying HKLM registry hives.

Monitoring Recommendations

Ingest Windows Security, Sysmon, and Defender logs into a centralized SIEM to correlate service-hosted process activity with privilege escalation indicators.
Track patch compliance for the August 2025 Microsoft security updates across all Windows client and server assets.
Alert on unsigned or unexpected modules loaded into Push Notifications-related processes.

How to Mitigate CVE-2025-53725

Immediate Actions Required

Apply the August 2025 Microsoft security update for each affected Windows version as documented in the Microsoft Security Update Guide.
Prioritize patching multi-user systems, terminal servers, and VDI hosts where local attackers are most likely to have footholds.
Restrict interactive logon rights on servers to reduce the population of users capable of triggering local exploitation.

Patch Information

Microsoft released cumulative updates addressing CVE-2025-53725 on August 12, 2025 for all supported Windows client and server editions listed in the advisory. Administrators should consult the vendor advisory to identify the specific KB article and package that applies to each affected build, then deploy through Windows Update, WSUS, Intune, or Configuration Manager.

Workarounds

No official workaround is published by Microsoft; installing the security update is the required remediation.
As a temporary compensating control, limit local logon and remote interactive access to trusted administrators on unpatched systems.
Enforce application allowlisting and least-privilege policies to reduce the ability of low-privileged users to execute arbitrary tooling that could trigger the flaw.

bash

# Verify patch installation status on Windows using PowerShell
Get-HotFix | Sort-Object -Property InstalledOn -Descending | Select-Object -First 20

# Check current OS build to confirm it meets the patched baseline
[System.Environment]::OSVersion.Version
(Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion').UBR