CVE-2021-33771
HighActively exploited (CISA KEV)
Description
Windows Kernel Elevation of Privilege Vulnerability
SeverityHigh
CVSS7.8
Exploit probability—
Product
Microsoft Windows
PublishedJul 14, 2021
First seenJul 14, 2021
Added to KEVNov 3, 2021
How to fix
CISA required action
Apply updates per vendor instructions.
CISA due date: Nov 17, 2021Update
- microsoft windows_10_150710.0.10240.19003 or later
- microsoft windows_10_160710.0.14393.4530 or later
- microsoft windows_10_180910.0.17763.2061 or later
- microsoft windows_10_190910.0.18363.1679 or later
- microsoft windows_10_200410.0.19041.1110 or later
- microsoft windows_10_20h210.0.19042.1110 or later
- microsoft windows_10_21h110.0.19043.1110 or later
- microsoft windows_server_200410.0.19041.1110 or later
- microsoft windows_server_201610.0.14393.4530 or later
- microsoft windows_server_201910.0.17763.2061 or later
- microsoft windows_server_20h210.0.19042.1110 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft windows_10_1507 | v < 10.0.10240.19003 | 10.0.10240.19003 |
| microsoft windows_10_1607 | v < 10.0.14393.4530 | 10.0.14393.4530 |
| microsoft windows_10_1809 | v < 10.0.17763.2061 | 10.0.17763.2061 |
| microsoft windows_10_1909 | v < 10.0.18363.1679 | 10.0.18363.1679 |
| microsoft windows_10_2004 | v < 10.0.19041.1110 | 10.0.19041.1110 |
| microsoft windows_10_20h2 | v < 10.0.19042.1110 | 10.0.19042.1110 |
| microsoft windows_10_21h1 | v < 10.0.19043.1110 | 10.0.19043.1110 |
| microsoft windows_8.1 | No range specified | — |
| microsoft windows_rt_8.1 | No range specified | — |
| microsoft windows_server_2004 | v < 10.0.19041.1110 | 10.0.19041.1110 |
| microsoft windows_server_2012 | No range specified | — |
| microsoft windows_server_2016 | v < 10.0.14393.4530 | 10.0.14393.4530 |
| microsoft windows_server_2019 | v < 10.0.17763.2061 | 10.0.17763.2061 |
| microsoft windows_server_20h2 | v < 10.0.19042.1110 | 10.0.19042.1110 |
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