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CVE-2021-1647

Published: Jan 12, 2021Updated: Oct 30, 2025 Sources: CVE List NVD BDUNVD-CWE-noinfo
NVD MITRE
7.8CVSSHIGH
EPSS Score
39.7%
Top 1.6%
CISA KEV
Active Exploitation
Since Nov 3, 2021
Exploits
No Known Exploits
Remediation
Patch Available

Description

Microsoft Defender Remote Code Execution Vulnerability

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

NVD-CWE-noinfo

Affected Products

Microsoft Security EssentialsMicrosoft Corp
On-prem
Operating Systems / windows
Windows DefenderMicrosoft Corp
On-premSecurity Product
Security Products / vuln-mgmt-scanner
System Center Endpoint ProtectionMicrosoft Corp
On-prem
Operating Systems / windows
System Center 2012 R2 Endpoint ProtectionMicrosoft Corp
On-prem
Operating Systems / windows
System Center 2012 Endpoint ProtectionMicrosoft Corp
On-prem
Operating Systems / windows
microsoft corpcommercialUSOperating Systemsaka microsoft corporation
and 8 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Nov 3, 2021
Remediation due:Nov 17, 2021

Required action: Apply updates per vendor instructions.

Official Patch Available

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1647
msrc.microsoft.com
https://www.cybersecurity-help.cz/vdb/SB2021011213
cybersecurity-help.cz
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1647
msrc.microsoft.com
and 2 more references View all →

Timeline

Published
Jan 12, 2021
Added to CISA KEV
Nov 3, 2021
Last Updated
Oct 30, 2025

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