CVE-2021-33771 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-33771HIGH

Microsoft Windows 10 Version 1507 — Windows Kernel Elevation of Privilege Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  U  H  H  H    7.8   .1017   95.3   YES

AFFECTED
  Product                  Versions        Fixed
  Windows 10 Version 1507  10.0.10240.0 –  —
  Windows 10 Version 1607  10.0.14393.0 –  —
  Windows 10 Version 1809  10.0.17763.0 –  —
  Windows 10 Version 1809  10.0.0 –        —
  Windows 10 Version 1909  10.0.0 –        —
  Windows 10 Version 2004  10.0.0 –        —
  Windows 10 Version 20H2  10.0.0 –        —
  Windows 10 Version 21H1  10.0.0 –        —
  Windows 8.1              6.3.0 –         —
  Windows Server 2012 R2   6.3.9600.0 –    —
  + 7 more

TIMELINE
  May 28  Reserved by microsoft
  Nov 3   Added to CISA KEV, remediation due 2021-11-17
  Nov 3   Published (CNA: microsoft)

CNA: microsoft · CVSS v3.1 · 3 references · NVD status: Analyzed · KEV due November 17, 2021

Description

Windows Kernel Elevation of Privilege Vulnerability

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 28, 2021	Reserved	Reserved by microsoft
November 3, 2021	KEV ADDED	Added to CISA KEV, remediation due 2021-11-17
November 3, 2021	Published	Published (CNA: microsoft)

Affected

Affected products and packages — 17 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Windows 10 Version 1507	—	10.0.10240.0	—
Microsoft	Windows 10 Version 1607	—	10.0.14393.0	—
Microsoft	Windows 10 Version 1809	—	10.0.17763.0	—
Microsoft	Windows 10 Version 1809	—	10.0.0	—
Microsoft	Windows 10 Version 1909	—	10.0.0	—
Microsoft	Windows 10 Version 2004	—	10.0.0	—
Microsoft	Windows 10 Version 20H2	—	10.0.0	—
Microsoft	Windows 10 Version 21H1	—	10.0.0	—
Microsoft	Windows 8.1	—	6.3.0	—
Microsoft	Windows Server 2012 R2	—	6.3.9600.0	—
Microsoft	Windows Server 2012 R2 (Server Core installation)	—	6.3.9600.0	—
Microsoft	Windows Server 2016	—	10.0.14393.0	—
Microsoft	Windows Server 2016 (Server Core installation)	—	10.0.14393.0	—
Microsoft	Windows Server 2019	—	10.0.17763.0	—
Microsoft	Windows Server 2019 (Server Core installation)	—	10.0.17763.0	—
Microsoft	Windows Server version 2004	—	10.0.0	—
Microsoft	Windows Server version 20H2	—	10.0.0	—

References (3)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33771 [Patch, Vendor Advisory]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33771 [Patch, Vendor Advisory]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33771 [US Government Resource]

Authoritative record: CVE-2021-33771 at cve.org

Vendors: microsoft

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-33771 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.

Description

Lifecycle

Affected

References (3)

Related

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