OnlyFm252
Windows DWM Core Library

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

Important CVSS 8.4 EPSS 0.06555 ⚠️ Exploited in the wild 📢 Publicly disclosed 2021-06 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 Jun 8 2021
Last Updated Jun 8 2021
Publicly Disclosed Yes
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.06555 — 0.92942 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
0.92942 percentile - updated 2026-06-21
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

On This Page