CVE-2021-33771

HIGH KEV

Windows Kernel - Privilege Escalation

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2021-33771 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added November 3, 2021.

Description

Windows Kernel Elevation of Privilege Vulnerability

References (2)

Core 2

Scores

CVSS v3 7.8
EPSS 0.0644
EPSS Percentile 91.3%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation active
Automatable no
Technical Impact total

Details

CISA KEV 2021-11-03
VulnCheck KEV 2021-07-13
InTheWild.io 2021-07-13
ENISA EUVD EUVD-2021-20448
Status published
Products (15)
microsoft/windows_10_1507 < 10.0.10240.19003
microsoft/windows_10_1607 < 10.0.14393.4530
microsoft/windows_10_1809 < 10.0.17763.2061
microsoft/windows_10_1909 < 10.0.18363.1679
microsoft/windows_10_2004 < 10.0.19041.1110
microsoft/windows_10_20h2 < 10.0.19042.1110
microsoft/windows_10_21h1 < 10.0.19043.1110
microsoft/windows_8.1
microsoft/windows_rt_8.1
microsoft/windows_server_2004 < 10.0.19041.1110
... and 5 more
Published Jul 14, 2021
KEV Added Nov 03, 2021
Tracked Since Feb 18, 2026