NULL pointer dereference in Microsoft Windows 10 Version 21h2
CVE-2026-83636
Null pointer dereference in Windows Hyper-V allows an authorized attacker to deny service locally.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Microsoft Windows 10 Version 21h2
- Microsoft Windows 10 Version 22h2
- Microsoft Windows 11 Version 23h2
- Microsoft Windows 11 Version 24h2
- Microsoft Windows 11 Version 25h2
- Microsoft Windows 11 Version 26h1
- Microsoft Windows 11 Version 26h2
- Microsoft Windows Server 2022
- Microsoft Windows Server 2025
- Microsoft Windows Server 2025 (Server Core Installation)
Weakness classification (CWE)
References
- Windows Hyper-V Denial of Service Vulnerability (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-83636?
- CVE-2026-83636 is a medium-severity vulnerability in Microsoft Windows 10 Version 21h2, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-10-13.
- How severe is CVE-2026-83636?
- Medium severity. CVSS v3 base score is 6.5 out of 10.