Local Privilege Escalation Risk in Microsoft Windows (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 vulnerability (CWE-416) located within the Microsoft Windows Win32 Kernel Subsystem. This flaw allows an attacker who already has authorized access to a system to elevate their privileges locally. On March 11, 2025, CISA added this vulnerability to its Known Exploited Vulnerabilities catalog, indicating that it is being actively exploited in the wild.

Exposure and applicability

This vulnerability applies to Microsoft Windows environments. In healthcare settings, this is particularly relevant for clinical workstations, administrative terminals, and servers used to store or process electronic Protected Health Information (ePHI).

Because this is a local privilege escalation flaw, it requires the attacker to first gain authorized access to the machine. However, once initial access is achieved—whether through compromised credentials or other means—this vulnerability could be used to bypass security boundaries and obtain higher-level permissions. This increases the risk of unauthorized data exfiltration or the deployment of malicious software across a healthcare network.

Remediation priorities

Our analysis suggests that healthcare organizations prioritize remediation based on the criticality of the system and its access to ePHI. We recommend the following actions:

1. Apply Vendor Updates: Prioritize the installation of official Microsoft mitigations for all Windows systems, starting with those that are internet-facing or handle high volumes of sensitive patient data.
2. Review Access Controls: Since this vulnerability requires an authorized attacker, auditing local user permissions and enforcing the principle of least privilege could reduce the number of accounts capable of attempting such an escalation.
3. Cloud Service Alignment: For organizations utilizing Windows via cloud services, we recommend following applicable BOD 22-01 guidance to ensure the underlying infrastructure is secured.

How to validate remediation

To verify that exposure has been reduced, security leaders and clinical engineering teams should employ the following methods:

• Patch Verification: Use authorized configuration management tools to confirm that the specific vendor updates addressing CVE-2025-24983 have been successfully deployed across all targeted endpoints.
• Version Auditing: Review system build numbers against the vendor’s list of patched versions to ensure no legacy or unpatched systems remain in the environment.

Limits and open questions

It is important to note that while patching reduces the likelihood of exploitation, it does not eliminate all risks associated with local access. The source indicates that the use of this vulnerability by known ransomware campaigns is currently unknown; however, privilege escalation is a common step in such attacks.

Additionally, organizations should be aware that CISA’s April 1, 2025, deadline applies specifically to covered federal agencies and is not a legal mandate for private healthcare providers, though it serves as a critical benchmark for risk management under the HIPAA Security Rule.

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 18, 2026 at 01:18 UTC.

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