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CVE-2021-1647

HighPublished

Microsoft Defender Remote Code Execution Vulnerability

Published: Jan 12, 2021
Updated: Oct 21, 2025
Assigning CNA: microsoft
Evidence observed: Nov 3, 2021

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

39.4%

Moderate · next 30 days

Percentile: 98.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

Microsoft Defender Remote Code Execution Vulnerability

Sources

cve-2021-1647PoC
Proof-of-concept exploit for Microsoft Defender Remote Code Execution Vulnerability (CVE-2021-1647) with password-protected payload archive.

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