CVE-2026-20820

HIGH

Windows Common Log File System Driver - Buffer Overflow

Title source: llm

Description

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

Exploits (1)

nomisec WORKING POC
by uname1able · poc
https://github.com/uname1able/CVE-2026-20820

References (1)

Scores

CVSS v3 7.8
EPSS 0.0003
EPSS Percentile 7.0%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-122
Status published
Products (40)
microsoft/windows_10_1607 < 10.0.14393.8783 (2 CPE variants)
microsoft/windows_10_1809 < 10.0.17763.8276 (2 CPE variants)
microsoft/windows_10_21h2 < 10.0.19044.6809
microsoft/windows_10_22h2 < 10.0.19045.6809
Microsoft/Windows 10 Version 1607 10.0.14393.0 - 10.0.14393.8783
Microsoft/Windows 10 Version 1809 10.0.17763.0 - 10.0.17763.8276
Microsoft/Windows 10 Version 21H2 10.0.19044.0 - 10.0.19044.6809
Microsoft/Windows 10 Version 22H2 10.0.19045.0 - 10.0.19045.6809
microsoft/windows_11_23h2 < 10.0.22631.6491
microsoft/windows_11_24h2 < 10.0.26100.7623
... and 30 more
Published Jan 13, 2026
Tracked Since Feb 18, 2026