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Tool Directory

CVE-2026-20820

HighPublished

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Published: Jan 13, 2026
Updated: Jul 30, 2026
Assigning CNA: microsoft
Evidence observed: Aug 25, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

2.6%

Low · next 30 days

Percentile: 84.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

Sources

CVE-2026-20820Exploit
Windows kernel exploit for CVE-2026-20820, targeting Windows 10 21H2 and Windows 11 23H2, built with Visual Studio 2022.

Responsible use

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