CVE-2025-24993: in the CISA KEV catalogue
Microsoft Windows NTFS Heap-Based Buffer Overflow Vulnerability. CISA added CVE-2025-24993 to the Known Exploited Vulnerabilities catalogue on 2025-03-11 with a default due date of 2025-04-01. Known ransomware campaign use: Unknown. Forensic triage flag: No.
Microsoft Windows New Technology File System (NTFS) contains a heap-based buffer overflow vulnerability that allows an unauthorized attacker to execute code locally. (CISA description)
- Vendor / product
- Microsoft Windows
- CWE
- CWE-122
- CISA required action
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS
- 2.2%, percentile 82 (scored 2026-11-03)
EPSS puts about 2.2 in 100 odds (2.2%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 82% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2025-24993 in the CISA KEV catalogue?
Yes. CISA added CVE-2025-24993 (Microsoft Windows NTFS Heap-Based Buffer Overflow Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2025-03-11. CISA's default due date for it is 2025-04-01.
Is CVE-2025-24993 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2025-24993. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2025-24993?
CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2025-24993