Windows Win32k Local Privilege Escalation (CVE-2025-24983)

Historical catalog analysis: CISA added this entry on March 11, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.

What the vulnerability is

CVE-2025-24983 is a Use-After-Free (CWE-416) vulnerability located within the Microsoft Windows Win32k kernel subsystem. This flaw allows an attacker who already possesses authorized local access to the system to elevate their privileges, potentially gaining higher-level administrative or system control.

Exposure and applicability

This vulnerability affects systems running Microsoft Windows that utilize the Win32k kernel component. Because this is a local privilege escalation (LPE) flaw, the primary exposure path requires an attacker to first establish a foothold on the target machine via authorized credentials or another initial access vector. Once present, the attacker can attempt to exploit the memory management error in the kernel subsystem to bypass security boundaries.

Remediation priorities

Given that this vulnerability has been added to CISA’s Known Exploited Vulnerabilities (KEV) catalog as of March 11, 2025, it should be prioritized for immediate remediation. Our analysis suggests the following priority sequence:

1. Identify Affected Assets: Inventory all Windows endpoints and servers to determine which versions are susceptible based on vendor documentation.
2. Apply Vendor Updates: Deploy the specific security updates provided by Microsoft via the MSRC update guide to address the Use-After-Free condition.
3. Cloud Service Review: For organizations utilizing cloud environments, review BOD 22-01 guidance to ensure that managed service providers have applied necessary mitigations to the underlying infrastructure.
4. Decommissioning: If a system cannot be patched and no viable compensating controls exist, consider discontinuing use of the affected product to eliminate the exposure.

How to validate remediation

Verification must move beyond simple version checks to ensure the vulnerability is actually mitigated. We recommend the following validation approach:

• Deployment Confirmation: Verify that the specific security update associated with CVE-2025-24983 is successfully installed across all identified assets.
• Configuration Audit: Ensure that kernel-level protections are active and that no legacy configurations have inadvertently disabled the updated subsystem components.
• Verification of Result: While a version check indicates a patch was applied, defenders should use authorized vulnerability scanning tools to confirm the system no longer reports as vulnerable to this specific CVE.

Limits and open questions

It remains unknown whether this vulnerability is being utilized in active ransomware campaigns. Additionally, while patching addresses the root cause, it does not prevent the initial local access required to trigger the exploit; therefore, existing identity and access management controls remain critical. Residual risk persists on systems where updates cannot be applied immediately due to compatibility constraints.

Source and editorial note

CVE-2025-24983: Microsoft Windows Win32k Use-After-Free Vulnerability · Source date: March 11, 2025 · Retrieved August 31, 2026.

Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.

Archive date: March 14, 2025. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: October 22, 2026 at 00:11 UTC.

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