CVE-2025-24062: Windows 10 21h2 Privilege Escalation Flaw

CVE-2025-24062 Overview

CVE-2025-24062 is a local privilege escalation vulnerability in the Windows Desktop Window Manager (DWM) Core Library caused by improper input validation. An authorized attacker who has already gained access to a system can exploit this flaw to elevate their privileges to a higher level, potentially gaining complete control over the affected Windows system.

Critical Impact

This vulnerability allows local privilege escalation through the Windows DWM Core Library, enabling attackers with low-level access to gain elevated privileges and achieve full system compromise across multiple Windows client and server versions.

Affected Products

• Microsoft Windows 10 21H2
• Microsoft Windows 10 22H2
• Microsoft Windows 11 22H2 (x64 and ARM64)
• Microsoft Windows 11 23H2 (x64 and ARM64)
• Microsoft Windows 11 24H2 (x64 and ARM64)
• Microsoft Windows Server 2022
• Microsoft Windows Server 2022 23H2
• Microsoft Windows Server 2025

Discovery Timeline

• April 8, 2025 - CVE-2025-24062 published to NVD
• July 3, 2025 - Last updated in NVD database

Technical Details for CVE-2025-24062

Vulnerability Analysis

This vulnerability resides in the Windows Desktop Window Manager (DWM) Core Library, a critical system component responsible for desktop composition and visual effects rendering in modern Windows operating systems. The DWM runs with elevated privileges to manage the graphical user interface and window rendering operations.

The flaw stems from improper input validation (CWE-20) within the DWM Core Library. When processing certain inputs, the library fails to adequately validate user-supplied data before using it in privileged operations. This validation gap creates an opportunity for an attacker with local access and low privileges to craft malicious input that bypasses security checks.

Successful exploitation requires local access to the target system and the attacker must have an authenticated user context. The attack does not require user interaction, making it easier to exploit once initial access is obtained.

Root Cause

The root cause of CVE-2025-24062 is improper input validation (CWE-20) in the Windows DWM Core Library. The vulnerable component does not properly sanitize or validate input parameters before processing them in a privileged context. This allows specially crafted input to influence execution flow or memory operations in unintended ways, ultimately enabling privilege escalation.

Attack Vector

The attack vector is local, requiring the attacker to have prior access to the target system with at least low-level user privileges. The exploitation scenario typically involves:

1. An attacker gains initial access to a Windows system through phishing, credential theft, or other means
2. Using their low-privileged account, the attacker interacts with the DWM Core Library
3. By supplying malformed or malicious input to the vulnerable component, the attacker triggers the improper validation flaw
4. The vulnerability allows the attacker to escalate privileges, potentially achieving SYSTEM-level access

The vulnerability affects both client and server editions of Windows, making it valuable in enterprise attack chains where lateral movement and privilege escalation are key objectives.

Detection Methods for CVE-2025-24062

Indicators of Compromise

• Unusual process behavior or crashes associated with dwm.exe or related DWM components
• Unexpected privilege escalation events from low-privileged user accounts
• Anomalous API calls or memory access patterns targeting DWM Core Library functions
• Security event logs showing privilege token manipulation or impersonation attempts

Detection Strategies

• Monitor Windows Security Event Logs for Event ID 4672 (Special privileges assigned to new logon) in unexpected contexts
• Deploy endpoint detection rules to identify suspicious interactions with dwmcore.dll and related binaries
• Implement behavioral analysis to detect privilege escalation patterns following low-privilege process execution
• Use SentinelOne's behavioral AI to identify anomalous privilege transitions and DWM exploitation attempts

Monitoring Recommendations

• Enable enhanced process auditing to capture detailed information about process creation and privilege changes
• Configure Windows Event Forwarding to centralize security logs from endpoints for correlation analysis
• Implement file integrity monitoring on critical Windows system files including DWM components
• Leverage SentinelOne Singularity Platform for real-time visibility into privilege escalation attempts and suspicious system behavior

How to Mitigate CVE-2025-24062

Immediate Actions Required

• Apply the security update from Microsoft immediately on all affected Windows systems
• Prioritize patching based on system criticality and exposure, starting with internet-facing and high-value assets
• Review and audit user accounts to ensure principle of least privilege is enforced
• Monitor for exploitation attempts using endpoint detection and response solutions

Patch Information

Microsoft has released a security patch addressing CVE-2025-24062 as part of their security update cycle. Organizations should obtain the update through Windows Update, Windows Server Update Services (WSUS), or the Microsoft Update Catalog. For detailed patching information and affected version specifics, refer to the Microsoft Security Response Center Advisory.

Workarounds

• Enforce strict least privilege policies to minimize the impact if the vulnerability is exploited
• Implement application control policies to restrict unauthorized code execution
• Segment networks to limit lateral movement opportunities for attackers who achieve initial compromise
• Enable and monitor Windows Defender Credential Guard where supported to protect privileged credentials
• Consider restricting local logon rights on sensitive systems to essential personnel only

# Verify Windows Update status and check for pending security updates
Get-WindowsUpdate -KBArticleID *CVE-2025-24062*

# Review current security event logging configuration
auditpol /get /category:"Privilege Use"

# Enable detailed process tracking in audit policy
auditpol /set /subcategory:"Process Creation" /success:enable /failure:enable