What is the CVSS score of CVE-2021-33739?

CVE-2021-33739 has a CVSS 3.1 base score of 8.4 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 6.6%.

Is CVE-2021-33739 being actively exploited?

Yes, CVE-2021-33739 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active in-the-wild exploitation. Immediate patching is required.

Is there a patch available for CVE-2021-33739?

Yes, a patch is available for CVE-2021-33739. Update the affected software to the latest version immediately.

Windows 10 1909 CVE-2021-33739

HIGH

2021-06-08 secure@microsoft.com

Microsoft Information Disclosure Windows 10 1909 Windows 10 2004 Windows 10 20H2 Windows 10 21H1 Windows Server 2004 Windows Server 20H2

8.4

CVSS 3.1 · Vendor: microsoft

Severity by source

Vendor (microsoft) PRIMARY

8.4 HIGH

AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from Vendor (microsoft) · only source for this CVE.

CVSS VectorVendor: microsoft

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

Jun 08, 2021 - 23:15 cve.org

HIGH 8.4

DescriptionCVE.org

Microsoft DWM Core Library Elevation of Privilege Vulnerability

AnalysisAI

Microsoft DWM Core Library Elevation of Privilege Vulnerability. Rated high severity (CVSS 8.4), this vulnerability is no authentication required, low attack complexity.

Technical ContextAI

Microsoft DWM Core Library Elevation of Privilege Vulnerability Affected products include: Microsoft Windows 10 1909, Microsoft Windows 10 2004, Microsoft Windows 10 20H2, Microsoft Windows 10 21H1, Microsoft Windows Server 2004.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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CVE-2021-33739 vulnerability details – vuln.today

Back

Windows 10 1909 CVE-2021-33739

Severity by source

CVSS VectorVendor: microsoft

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

More in Windows 10 1909

Same technique Information Disclosure

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External POC / Exploit Code