CVE-2021-43240

HIGH

Windows 10 and Windows 11 - Elevation of Privilege via NTFS Set Short Name

Title source: llm

NTFS Set Short Name Elevation of Privilege Vulnerability

Core 1

Core References

Patch, Vendor Advisory x_refsource_misc

CVSS v3 7.8

EPSS 0.0056

EPSS Percentile 43.1%

Attack Vector LOCAL

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

Vulnrichment

Exploitation poc

Automatable no

Technical Impact total

Status published

Products (9)

microsoft/windows_10 20h2 (3 CPE variants)

microsoft/windows_10 21h1 (3 CPE variants)

microsoft/windows_10 21h2 (3 CPE variants)

microsoft/windows_10 1909 (3 CPE variants)

microsoft/windows_10 2004 (3 CPE variants)

microsoft/windows_11 (2 CPE variants)

microsoft/windows_server 20h2

microsoft/windows_server 2022

microsoft/windows_server_2016 2004

Published Dec 15, 2021

Tracked Since Feb 18, 2026