CVE-2021-41339 — Microsoft DWM Core Library Elevation of Privilege Vulnerability

Executive Summary

None

Overview

4.7

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Elevation of Privilege

Released Oct 12 2021

Last Updated Oct 12 2021

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.00455 — 0.37633 percentile

NVD CVSS 4.7 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C

ATTACK VECTOR

Local

ATTACK COMPLEXITY

High

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

None

AVAILABILITY

None

EXPLOIT CODE MATURITY

Proof-of-Concept

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 4.2

EPSS Score

0.00455

probability of exploitation in the next 30 days

0.37633 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

17 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1909 for 32-bit Systems	`5006667 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1909 for ARM64-based Systems	`5006667 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1909 for x64-based Systems	`5006667 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 2004 for 32-bit Systems	`5006670 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 2004 for ARM64-based Systems	`5006670 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 2004 for x64-based Systems	`5006670 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 20H2 for 32-bit Systems	`5006670 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 20H2 for ARM64-based Systems	`5006670 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 21H1 for 32-bit Systems	`5006670 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 21H1 for ARM64-based Systems	`5006670 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 21H1 for x64-based Systems	`5006670 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 11 version 21H2 for ARM64-based Systems	`5006674 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 11 version 21H2 for x64-based Systems	`5006674 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2022	`5006699 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2022 (Server Core installation)	`5006699 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server, version 2004 (Server Core installation)	`5006670 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server, version 20H2 (Server Core Installation)	`5006670 (Security Update)`	Important	Elevation of Privilege	Yes

Patches

4 patches

Article	Type	Restart
`5006667`	Security Update	Yes
`5006670`	Security Update	Yes
`5006674`	Security Update	Yes
`5006699`	Security Update	Yes

Exploits & PoC

No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.

Detection Rules

No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.

Acknowledgments

He YiSheng, Zhang WangJunJie, Li WenYue
He YiSheng, Zhang WangJunJie, and Li WenYue of Hillstone Network Security Research Institute

References

MSRC Advisory MITRE NVD