CVE-2025-24060: Windows 10 1809 Privilege Escalation Flaw

CVE-2025-24060 Overview

CVE-2025-24060 is an elevation of privilege vulnerability in the Windows Desktop Window Manager (DWM) Core Library. The flaw stems from improper input validation [CWE-20] within the DWM Core Library component. An authenticated local attacker can exploit this weakness to elevate privileges on affected Windows systems. Microsoft published the advisory on April 8, 2025, and the issue affects a broad range of Windows client and server releases. Successful exploitation provides high impact to confidentiality, integrity, and availability of the targeted host.

Critical Impact

An authorized local attacker can escalate to higher privileges by sending malformed input to the Windows DWM Core Library, gaining SYSTEM-level capabilities on unpatched hosts.

Affected Products

• Microsoft Windows 10 (1809, 21H2, 22H2)
• Microsoft Windows 11 (22H2, 23H2, 24H2)
• Microsoft Windows Server 2019, 2022, 2022 23H2, and 2025

Discovery Timeline

• 2025-04-08 - Microsoft releases security update and publishes Microsoft CVE-2025-24060 Update Guide
• 2025-04-08 - CVE-2025-24060 published to the National Vulnerability Database
• 2025-07-03 - Last updated in NVD database

Technical Details for CVE-2025-24060

Vulnerability Analysis

The Desktop Window Manager (DWM) is the compositing window manager responsible for rendering the Windows graphical interface. Its Core Library exposes interfaces consumed by user-mode processes during window composition and graphics operations. CVE-2025-24060 results from improper input validation within this component. A local attacker with valid credentials can supply malformed parameters that the library fails to validate before use.

Because DWM operates with elevated privileges to manage display state for all sessions, a successful exploit grants the attacker code execution at a higher integrity level than the calling process. The CWE-20 classification reflects this missing or incorrect input check rather than a memory safety primitive. Local attack prerequisites limit remote exploitation, but the vulnerability is well suited as a post-compromise privilege escalation primitive paired with initial access through phishing, malware, or stolen credentials.

Root Cause

The root cause is insufficient validation of attacker-controlled input passed into the DWM Core Library. The library accepts data without verifying that values fall within expected bounds or formats. This allows an authorized caller to influence privileged execution flow inside the graphics subsystem.

Attack Vector

Exploitation requires local access and low-privileged credentials on the target system. No user interaction is necessary. The attacker invokes the vulnerable DWM Core Library interface from a low-integrity process and supplies crafted input that triggers the validation flaw, resulting in execution at the privilege level of the DWM service. No public proof-of-concept code is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

No verified exploitation code is publicly available. Refer to the Microsoft CVE-2025-24060 Update Guide for vendor technical detail.

Detection Methods for CVE-2025-24060

Indicators of Compromise

• Unexpected child processes spawned by dwm.exe or processes inheriting tokens from the Desktop Window Manager session.
• Crashes or anomalous restarts of dwm.exe recorded in the Windows Application event log, which may indicate failed exploitation attempts.
• New scheduled tasks, services, or registry persistence entries created shortly after suspicious DWM activity on the host.

Detection Strategies

• Monitor process lineage for unusual children of dwm.exe, particularly command interpreters like cmd.exe, powershell.exe, or rundll32.exe.
• Alert on integrity-level transitions where a low or medium integrity process suddenly executes follow-on actions at SYSTEM integrity.
• Hunt for low-privileged accounts that gain SYSTEM-level access without a corresponding legitimate service or installer event.

Monitoring Recommendations

• Forward Sysmon Event IDs 1 (process create), 10 (process access), and 11 (file create) to a centralized analytics platform and correlate around dwm.exe.
• Track Windows Defender, EDR, and kernel-mode telemetry for in-memory injection or token manipulation targeting the graphics subsystem.
• Validate patch deployment across all in-scope endpoints and servers using configuration management reporting, prioritizing systems with interactive logon use.

How to Mitigate CVE-2025-24060

Immediate Actions Required

• Apply the April 2025 Microsoft security update referenced in the Microsoft CVE-2025-24060 Update Guide to all affected Windows 10, Windows 11, and Windows Server systems.
• Prioritize patching multi-user systems such as Remote Desktop Session hosts and Virtual Desktop Infrastructure where low-privileged users can run code locally.
• Audit local account usage and remove unnecessary interactive logon rights to reduce the population of users who can attempt local exploitation.

Patch Information

Microsoft addressed CVE-2025-24060 in its April 8, 2025 security update cycle. Administrators should consult the Microsoft CVE-2025-24060 Update Guide for the exact KB article matching each operating system build and apply it through Windows Update, WSUS, Intune, or equivalent management tooling.

Workarounds

• No vendor-supplied workaround exists; applying the official patch is the only supported remediation.
• Restrict local logon and Remote Desktop access to trusted administrators on systems that cannot be patched immediately.
• Enforce application allow-listing and credential hygiene to limit the ability of an unauthorized user to obtain the local foothold required for exploitation.

# Verify patch status on a Windows host (PowerShell)
Get-HotFix | Sort-Object -Property InstalledOn -Descending | Select-Object -First 10