CVE-2025-64679 Overview
CVE-2025-64679 is a heap-based buffer overflow vulnerability in the Windows Desktop Window Manager (DWM) Core Library. An authenticated local attacker can exploit this flaw to elevate privileges on affected Windows systems. The vulnerability is tracked under CWE-122: Heap-based Buffer Overflow and affects a broad range of Windows client and server releases, including Windows 10, Windows 11, and Windows Server editions from 2016 through 2025.
Critical Impact
Successful exploitation grants an attacker elevated privileges on the local system, enabling full compromise of confidentiality, integrity, and availability.
Affected Products
- Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
- Microsoft Windows 11 (versions 22H2, 23H2, 24H2, 25H2)
- Microsoft Windows Server 2016, 2019, 2022, 2022 23H2, and 2025
Discovery Timeline
- 2025-12-09 - CVE-2025-64679 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-64679
Vulnerability Analysis
The vulnerability resides in the Windows DWM Core Library, a component that manages the composition of desktop graphics and window rendering. DWM runs with elevated privileges and processes graphics-related input from user-mode applications. A heap-based buffer overflow in this component allows an authorized local user to write data beyond the bounds of a heap-allocated buffer.
By triggering the overflow through crafted input to DWM interfaces, an attacker can corrupt adjacent heap structures. Successful memory corruption within the privileged DWM context leads to code execution at a higher integrity level than the calling process. Exploitation requires the attacker to already have local access with low privileges but does not require user interaction.
Root Cause
The root cause is classified as CWE-122: Heap-based Buffer Overflow. The DWM Core Library fails to correctly validate the size or bounds of data written into a heap buffer. When an attacker supplies input that exceeds the allocated buffer, adjacent heap metadata or object pointers can be overwritten, enabling privilege escalation to SYSTEM.
Attack Vector
Exploitation requires local access and low-level authenticated privileges. The attacker interacts with the DWM subsystem from a standard user context and supplies crafted graphics or composition data that triggers the overflow. No user interaction is required, and the attack complexity is low. Microsoft has not published detailed exploitation technique information. For additional context, refer to the Microsoft CVE-2025-64679 Advisory.
Detection Methods for CVE-2025-64679
Indicators of Compromise
- Unexpected crashes or restarts of the dwm.exe process, which may indicate failed exploitation attempts against the DWM Core Library.
- New processes spawning as SYSTEM from parent processes running under standard user contexts.
- Application error events referencing DWM modules in the Windows Event Log around the time of suspicious activity.
Detection Strategies
- Monitor endpoint telemetry for anomalous child processes created by dwm.exe or unusual DWM API interactions from unprivileged user sessions.
- Enable Windows Defender Exploit Guard and audit logging for privilege escalation and process integrity changes.
- Correlate crash dumps in dwmcore.dll with subsequent privilege escalation events across the environment.
Monitoring Recommendations
- Enable process creation auditing (Event ID 4688) and track token elevation events (Event ID 4672) originating from standard user sessions.
- Ingest Windows Error Reporting telemetry into a centralized log platform to detect repeated DWM crashes.
- Baseline normal DWM behavior on production systems and alert on statistically significant deviations in crash frequency.
How to Mitigate CVE-2025-64679
Immediate Actions Required
- Apply the Microsoft security update for CVE-2025-64679 to all affected Windows client and server systems as soon as possible.
- Prioritize patching on multi-user systems, terminal servers, and virtual desktop infrastructure where local privilege escalation has higher impact.
- Restrict local logon rights to trusted accounts and enforce the principle of least privilege on interactive systems.
Patch Information
Microsoft has released security updates addressing CVE-2025-64679. Consult the Microsoft CVE-2025-64679 Advisory for the full list of affected builds and their corresponding update KB identifiers. Deploy the applicable cumulative update for each Windows version through Windows Update, WSUS, or your enterprise patch management platform.
Workarounds
- No official workaround has been published by Microsoft; applying the security update is the recommended remediation.
- Reduce exposure by limiting the number of users with interactive logon rights on high-value systems until patches are deployed.
- Enforce application allowlisting to prevent execution of untrusted binaries that could deliver exploit payloads to the DWM subsystem.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
