CVE-2021-33771

Published: Jul 14, 2021Modified: Aug 10, 2026CISA KEV

7.8

Vector

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

Exploitability: 1.8 / Impact: 5.9

Source: NVD (Secondary)

Description

Windows Kernel Elevation of Privilege Vulnerability

Affected (14)

Products: Microsoft: Windows 10 1507, Windows 10 1607, Windows 10 1809, Windows 10 1909, Windows 10 2004, Windows 10 20h2, Windows 10 21h1, Windows 8.1, Windows Rt 8.1, Windows Server 2004, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 20h2

14 products

Windows 10 1507

Windows 10 1607

Windows 10 1809

Windows 10 1909

Windows 10 2004

Windows 10 20h2

Windows 10 21h1

Windows Server 2004

Windows Server 2012

Windows Server 2016

Windows Server 2019

Windows Server 20h2

Configuration A

14 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1507	version < 10.0.10240.19003
Microsoft Windows 10 1607	version < 10.0.14393.4530
Microsoft Windows 10 1809	version < 10.0.17763.2061
Microsoft Windows 10 1909	version < 10.0.18363.1679
Microsoft Windows 10 2004	version < 10.0.19041.1110
Microsoft Windows 10 20h2	version < 10.0.19042.1110
Microsoft Windows 10 21h1	version < 10.0.19043.1110
Microsoft Windows 8.1	All versions
Microsoft Windows Rt 8.1	All versions
Microsoft Windows Server 2004	version < 10.0.19041.1110
Microsoft Windows Server 2012	All versions
Microsoft Windows Server 2016	version < 10.0.14393.4530
Microsoft Windows Server 2019	version < 10.0.17763.2061
Microsoft Windows Server 20h2	version < 10.0.19042.1110

References (3)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33771

Source: secure@microsoft.com

PatchVendor Advisory

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33771

Source: af854a3a-2127-422b-91ae-364da2661108

PatchVendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33771

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

US Government Resource

Timeline

No history available yet.