Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2021-33739
Microsoft DWM Core Library Elevation of Privilege Vulnerability
AV AC PR UI S C I A CVSS EPSS %ile KEV
L L N N U H H H 8.4 .0655 93.6 YES
AFFECTED
Product Versions Fixed
Windows 10 Version 1909 10.0.0 – —
Windows 10 Version 21H1 10.0.0 – —
Windows 10 Version 2004 10.0.0 – —
Windows Server version 2004 10.0.0 – —
Windows 10 Version 20H2 10.0.0 – —
Windows Server version 20H2 10.0.0 – —
TIMELINE
May 28 Reserved by microsoft
Jun 8 Published (CNA: microsoft)
Nov 3 Added to CISA KEV, remediation due 2021-11-17
Description
Microsoft DWM Core Library Elevation of Privilege Vulnerability
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| May 28, 2021 | Reserved | Reserved by microsoft |
| June 8, 2021 | Published | Published (CNA: microsoft) |
| November 3, 2021 | KEV ADDED | Added to CISA KEV, remediation due 2021-11-17 |
Affected
Affected products and packages — 6 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Microsoft | Windows 10 Version 1909 | — | 10.0.0 | — |
| Microsoft | Windows 10 Version 21H1 | — | 10.0.0 | — |
| Microsoft | Windows 10 Version 2004 | — | 10.0.0 | — |
| Microsoft | Windows Server version 2004 | — | 10.0.0 | — |
| Microsoft | Windows 10 Version 20H2 | — | 10.0.0 | — |
| Microsoft | Windows Server version 20H2 | — | 10.0.0 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-33739 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, October 7, 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.
