⚠ Actively exploited
Added to CISA KEV on 2021-11-03. Federal agencies required to patch by 2021-11-17. Required action: Apply updates per vendor instructions..

CVE-2021-33771

CWE-119 — Buffer OverflowCWE-269 — Improper Privilege Management8 documents8 sources
Severity
7.8HIGH
EPSS
6.6%
top 8.79%
CISA KEV
KEV
Added 2021-11-03
Due 2021-11-17
Exploit
Exploited in wild
Active exploitation observed
Affected products
25
Microsoft Windows 10 Version 1507Microsoft Windows 10 Version 1607Microsoft Windows 10 Version 1809+22 more
Timeline
PublishedJul 14
KEV addedNov 3
KEV dueNov 17
Latest updateMay 24
CISA Required Action: Apply updates per vendor instructions.

Description

Windows Kernel Elevation of Privilege Vulnerability

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages24 packages

▶NVDmicrosoft/windows< 10.0.19041.1110+3
▶CVEListV5microsoft/windows_8.16.3.0 — 6.3.9600.20069
▶NVDmicrosoft/windows_10_1507< 10.0.10240.19003
▶NVDmicrosoft/windows_10_1607< 10.0.14393.4530
▶NVDmicrosoft/windows_10_1809< 10.0.17763.2061

Patches

Patch: portal.msrc.microsoft.com ↗Patch: portal.msrc.microsoft.com ↗

🔴Vulnerability Details

4
GHSA
GHSA-jv37-xg37-jxgp: Windows Kernel Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-31979, CVE-2021-34514↗2022-05-24
▶
Project0
The More You Know, The More You Know You Don’t Know - Project Zero↗2022-04-01
▶
CVEList
Windows Kernel Elevation of Privilege Vulnerability↗2021-07-14
▶
VulnCheck
Microsoft Windows Kernel Privilege Escalation Vulnerability↗2021
▶

📋Vendor Advisories

2
CISA
Microsoft Windows Kernel Privilege Escalation Vulnerability↗2021-11-03
▶
Microsoft
Windows Kernel Elevation of Privilege Vulnerability↗2021-07-13
▶
CVE-2021-33771 (HIGH CVSS 7.8) | Windows Kernel Elevation of Privile | cvebase.io