# CVE-2021-33739: Microsoft DWM Core Library Elevation of Privilege Vulnerability

> CVE-2021-33739: Microsoft DWM Core Library Elevation of Privilege Vulnerability. CVSS 8.4 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-33739
Last updated: 2025-10-21T23:25:43Z

- Published: 2021-06-08 22:46 UTC · Updated: 2025-10-21 23:25 UTC · Assigner: microsoft
- CVSS: 8.4 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
- EPSS: 6.6%, 94th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2021-11-17, ransomware use: Unknown

## Description

Microsoft DWM Core Library Elevation of Privilege Vulnerability

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Microsoft: Windows 10 Version 1909
- Microsoft: Windows 10 Version 2004
- Microsoft: Windows 10 Version 20H2
- Microsoft: Windows 10 Version 21H1
- Microsoft: Windows Server version 2004
- Microsoft: Windows Server version 20H2

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-33739)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-33739)
- [https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33739](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33739)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-33739 · Markdown: https://rewindex.com/cve/CVE-2021-33739.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-33739 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:06:19.133Z