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

Important CVSS 8.4 EPSS 0.06555 ⚠️ Exploited in the wild 📢 Publicly disclosed 2021-07 archive

Executive Summary

None

Overview

8.4

CVSS HIGH

Important

MS Severity

Exploited

MS Exploit Status

Exploitation Detected

MS Exploit Likelihood

Category Elevation of Privilege

Released Jul 13 2021

Last Updated Jul 13 2021

Publicly Disclosed Yes

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.06555 — 0.93198 percentile

NVD CVSS 8.4 HIGH — matches MSRC

CVSS 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

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Functional

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 7.8

EPSS Score

0.06555

probability of exploitation in the next 30 days

0.93198 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

13 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1909 for 32-bit Systems	`5003635 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1909 for ARM64-based Systems	`5003635 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1909 for x64-based Systems	`5003635 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 2004 for 32-bit Systems	`5003637 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 2004 for ARM64-based Systems	`5003637 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 2004 for x64-based Systems	`5003637 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 20H2 for 32-bit Systems	`5003637 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 20H2 for ARM64-based Systems	`5003637 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 21H1 for 32-bit Systems	`5003637 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 21H1 for ARM64-based Systems	`5003637 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 21H1 for x64-based Systems	`5003637 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server, version 2004 (Server Core installation)	`5003637 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server, version 20H2 (Server Core Installation)	`5003637 (Security Update)`	Important	Elevation of Privilege	Yes

Patches

2 patches

Article	Type	Restart
`5003635`	Security Update	Yes
`5003637`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Tu XiaoYi with DBAPPSecurity Threat Intelligence Center
Dong Wu with DBAPPSecurity Threat Intelligence Center
Jinquan(@jq0904)

References

MSRC Advisory MITRE NVD

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