Exploited vulnerability · CISA KEV
Yes. CVE-2025-24993, Microsoft Windows NTFS Heap-Based Buffer Overflow Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 11 Mar 2025, the day it was published. It affects Microsoft Windows. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Microsoft Windows New Technology File System (NTFS) contains a heap-based buffer overflow vulnerability that allows an unauthorized attacker to execute code locally.
| Vendor | Microsoft (391 exploited CVEs in KEV) |
| Product | Windows |
| Vulnerability | Microsoft Windows NTFS Heap-Based Buffer Overflow Vulnerability |
| Weakness | CWE-122 |
| Published | 11 Mar 2025 |
| Added to KEV | 11 Mar 2025 |
| Reported by (CNA) | microsoft |
Yes. CISA added CVE-2025-24993 to the Known Exploited Vulnerabilities catalog on 11 Mar 2025, which means there is reliable evidence of exploitation in the wild.
CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Windows and watch it for signs of compromise.
Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in March 2025 · Microsoft scorecard · act-now radar.
We check exposure across your estate, patch or mitigate with your team, and set up detection for what attackers do after exploiting it.
Get in touch →