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 vulnerability (CWE-122) located within the Microsoft Windows New Technology File System (NTFS). This flaw allows an unauthorized attacker with local access to the system to execute arbitrary code. Because NTFS is the primary file system for most Windows installations, this vulnerability affects the core layer where data is stored and managed.
Exposure and applicability
This vulnerability is applicable to healthcare organizations utilizing Microsoft Windows operating systems across their infrastructure. In a clinical environment, this includes workstations used for patient charting, servers hosting electronic protected health information (ePHI), and administrative systems.
Because the vulnerability requires local access for execution, it does not allow an attacker to enter a network remotely via this specific flaw. However, if an attacker has already gained a foothold on a system—or if a malicious actor has physical or authorized local access—this vulnerability could potentially be used to escalate privileges or execute unauthorized commands, threatening the integrity and availability of patient data.
Remediation priorities
Our analysis suggests that healthcare security leaders should prioritize remediation based on the criticality of the system’s role in patient care and the sensitivity of the data it stores. We recommend the following prioritized actions:
- Apply Vendor Updates: The primary defense is to apply the mitigations provided by Microsoft. This should be prioritized for systems that handle high volumes of ePHI or those with higher risks of local access.
- Restrict Local Access: To reduce the likelihood of exploitation, organizations should review and enforce the principle of least privilege (PoLP). Limiting who has local login rights on critical servers and workstations reduces the number of potential vectors for local code execution.
- Coordinate Clinical Engineering Reviews: For systems integrated with medical devices or specialized clinical software, updates should be coordinated with clinical engineering teams to ensure that patching does not disrupt patient care operations or violate vendor support agreements.
How to validate remediation
To verify that the risk has been reduced, security teams can employ the following methods:
- Version Verification: Confirm that the specific security updates addressing CVE-2025-24993 have been successfully installed across the fleet via centralized patch management reports.
- Configuration Audit: Review local user groups on high-value assets to ensure only necessary personnel have local access, thereby limiting the attack surface for local execution flaws.
It is important to note that while these steps reduce exposure, a version check alone does not guarantee that a system is entirely secure from all threats.
Limits and open questions
There are several unknowns regarding this vulnerability. It is currently unknown if this flaw has been utilized in active ransomware campaigns. Additionally, because the vulnerability is local in nature, the total risk depends heavily on the existing perimeter and internal access controls of the specific healthcare environment.
Applying updates could reduce the likelihood of exploitation, but it may not eliminate all residual risks associated with heap-based overflows if other system vulnerabilities exist. Organizations should continue to monitor vendor guidance for any updated mitigation strategies.
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 18, 2026 at 01:35 UTC.
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