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CVE-2021-1647

Microsoft Defender Remote Code Execution Vulnerability

HIGH
7.8
CVSS Score
Published: January 12, 2021 at 07:42 PM UTC
Updated: June 17, 2026 at 03:32 AM UTC
20 products affected across 1 vendorWindows DefenderSecurity EssentialsSystem Center Endpoint Protection

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Severity
HIGH7.8
Exploitation
CISA KEV
Exploit prediction
EPSS 40%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score39.7%

EPSS (Exploit Prediction Scoring System) estimates a 39.7% chance this CVE is exploited in the wild within the next 30 days — higher than 99% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Microsoft Defender contains an unspecified vulnerability that allows for remote code execution.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
Nov 3, 2021
Remediation Due
Nov 17, 2021
1804 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-1647

Description

Microsoft Defender Remote Code Execution Vulnerability

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Security Essentials· Microsoft
95%
All versions
System Center Endpoint Protection· Microsoft
95%
20122012 r2
Windows Defender· Microsoft
95%
All versions
microsoft-windows-10-1507 (environment) · microsoft-windows-10-1607 (environment) · microsoft-windows-10-1803 (environment) · microsoft-windows-10-1809 (environment) · microsoft-windows-10-1909 (environment) · microsoft-windows-10-2004 (environment) · microsoft-windows-10-20h2 (environment) · microsoft-windows-7 (environment) · microsoft-windows-8-1 (environment) · microsoft-windows-rt-8-1 (environment) · microsoft-windows-server-1909 (environment) · microsoft-windows-server-2004 (environment) · microsoft-windows-server-2008 (environment) · microsoft-windows-server-2012 (environment) · microsoft-windows-server-2016 (environment) · microsoft-windows-server-2019 (environment) · microsoft-windows-server-20h2 (environment)
Windows 10 1507· Microsoftdevice
80%
All versions
Windows 10 1607· Microsoftdevice
80%
All versions
Windows 10 1803· Microsoftdevice
80%
All versions
Windows 10 1809· Microsoftdevice
80%
All versions
Windows 10 1909· Microsoftdevice
80%
All versions
Windows 10 2004· Microsoftdevice
80%
All versions
Windows 10 20H2· Microsoftdevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Vendor AdvisoryPatch
Source: [email protected]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1647
PatchVendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1647
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1647

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
NVD-CWE-noinfo

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