Windows NTFS Heap-Based Buffer Overflow (CVE-2025-24993)

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-2025-24993 is a heap-based buffer overflow (CWE-122) located within the Microsoft Windows New Technology File System (NTFS). This flaw allows an unauthorized attacker to execute arbitrary code locally on the affected system.

Exposure and applicability

This vulnerability affects systems running Microsoft Windows that utilize the NTFS file system. Because the exploit requires local access, the primary exposure path involves an attacker who has already established a foothold on the machine or a malicious actor with local user privileges seeking to escalate their capabilities through code execution.

Remediation priorities

Based on our analysis of the vulnerability’s nature and its inclusion in the CISA Known Exploited Vulnerabilities catalog, we recommend the following prioritization for infrastructure owners:

1. Immediate Patching: Prioritize the application of vendor-supplied updates across all Windows endpoints and servers using NTFS. This is the primary method to address the underlying buffer overflow.
2. Cloud Service Review: For organizations utilizing cloud environments, review configurations against BOD 22-01 guidance to ensure that managed services are updated according to provider schedules.
3. Asset Identification: Identify all legacy or isolated systems where NTFS is active but updates may be delayed, as these represent persistent points of local exposure.

How to validate remediation

To verify that the risk has been reduced, defenders should move beyond simple version checks. We recommend the following validation approach:

• Deployment Verification: Confirm via centralized patch management logs that the specific update addressing CVE-2025-24993 has been successfully installed and that the system has been rebooted to finalize the application of the fix.
• Configuration Audit: Ensure that no legacy NTFS configurations or outdated drivers are bypassing current security updates.

It is important to note that a successful update installation indicates the patch is present, but it does not guarantee the absence of other local vectors that could be used in conjunction with this vulnerability.

Limits and open questions

While the vulnerability is documented as allowing local code execution, several factors remain unknown. The source does not specify if this flaw is currently being leveraged by known ransomware campaigns. Additionally, because the exploit is local, the total risk depends heavily on the existing security posture of the host—specifically the effectiveness of other controls that prevent initial access to the system. Residual risk remains for any systems where vendor mitigations cannot be applied or where third-party software interferes with the update process.

Source and editorial note

CVE-2025-24993: Microsoft Windows NTFS Heap-Based Buffer Overflow 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 00:29 UTC.

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