CVE-2021-31979

Published: Jul 14, 2021Modified: Oct 29, 2025CISA 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 (18)

Products: Microsoft: Windows 10 1507, Windows 10 1607, Windows 10 1809, Windows 10 1909, Windows 10 2004, Windows 10 20h2, Windows 10 21h1, Windows 7, Windows 8.1, Windows Rt 8.1, Windows Server 2004, Windows Server 2008, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 20h2

16 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 2008

Windows Server 2012

Windows Server 2016

Windows Server 2019

Windows Server 20h2

Configuration A

18 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1507	Before 10.0.10240.19003
Microsoft Windows 10 1607	Before 10.0.14393.4530
Microsoft Windows 10 1809	Before 10.0.17763.2061
Microsoft Windows 10 1909	Before 10.0.18363.1679
Microsoft Windows 10 2004	Before 10.0.19041.1110
Microsoft Windows 10 20h2	Before 10.0.19042.1110
Microsoft Windows 10 21h1	Before 10.0.19043.1110
Microsoft Windows 7	All versions
Microsoft Windows 8.1	All versions
Microsoft Windows Rt 8.1	All versions
Microsoft Windows Server 2004	Before 10.0.19041.1110
Microsoft Windows Server 2008	All versions
Microsoft Windows Server 2008	Version r2 sp1
Microsoft Windows Server 2012	All versions
Microsoft Windows Server 2012	Version r2
Microsoft Windows Server 2016	Before 10.0.14393.4530
Microsoft Windows Server 2019	Before 10.0.17763.2061
Microsoft Windows Server 20h2	Before 10.0.19042.1110

Related CWEs

Improper Restriction of Operations within the Bounds of a Memory Buffer

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

References (3)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31979

Source: secure@microsoft.com

PatchVendor Advisory

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31979

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

PatchVendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31979

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

US Government Resource

Timeline

No history available yet.