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Windows Defender CVE-2021-1647

HIGH
2021-01-12 secure@microsoft.com
7.8
CVSS 3.1 · Vendor: microsoft
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Severity by source

Vendor (microsoft) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/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:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Added to CISA KEV
Jul 14, 2026 - 04:22 CISA
CVE Published
Jan 12, 2021 - 20:15 cve.org
HIGH 7.8

DescriptionCVE.org

Microsoft Defender Remote Code Execution Vulnerability

AnalysisAI

Microsoft Defender Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity.

Technical ContextAI

Affected products include: Microsoft Windows Defender, Microsoft Security Essentials, Microsoft System Center Endpoint Protection.

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-2021-1647 vulnerability details – vuln.today

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