CVE-2026-20840
HighCVSS 7.8Exploitation Probability (EPSS)
Very high risk90th percentile - higher than 90% of all known CVEs
Summary
A heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
Risk Assessment
An authorized attacker can execute arbitrary code in kernel context, potentially leading to full system compromise.
Recommendation
Install the latest Windows security updates from Microsoft.
Other vulnerabilities in Windows NTFS
See all- CVE-2026-69463Critical
Heap-based buffer overflow in Windows NTFS allows an unauthorized attacker to execute code over a network.
- CVE-2026-83995High
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges locally.
- CVE-2026-77503High
An out-of-bounds read in Windows NTFS allows an unauthorized attacker to elevate privileges locally.
- CVE-2026-72935Medium
Out-of-bounds read in Windows NTFS allows an authorized attacker to elevate privileges locally.
- CVE-2026-71329Medium
Heap-based buffer overflow in Windows NTFS allows an unauthorized attacker to execute code via a physical attack.
- CVE-2026-69875High
A heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over a network.
- CVE-2026-69709High
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
- CVE-2026-69638High
Heap-based buffer overflow in Windows NTFS allows an unauthorized attacker to execute code locally.
- CVE-2026-69591Medium
An out-of-bounds read vulnerability in Windows NTFS allows an authorized attacker to disclose information over a network.
- CVE-2026-69567High
Use after free in Windows NTFS allows an authorized attacker to elevate privileges locally.
Original NVD description (English source)
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.