Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

CVE-2021-1647

Microsoft Defender Remote Code Execution Vulnerability

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.8, requiring local system access to exploit with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 20 products from microsoft, from microsoft, from microsoft and 17 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-01-12T20:15:30.727

Last Modified

2025-10-30T19:56:27.730

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 7.8 (HIGH)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:C/I:C/A:C

Access Vector: LOCAL
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

3.9

Impact Score

10.0

Weaknesses

Type: Primary
NVD-CWE-noinfo

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	microsoft	windows_defender	-	Yes
Operating System	microsoft	windows_10_1507	-	No
Operating System	microsoft	windows_10_1607	-	No
Operating System	microsoft	windows_10_1803	-	No
Operating System	microsoft	windows_10_1809	-	No
Operating System	microsoft	windows_10_1909	-	No
Operating System	microsoft	windows_10_2004	-	No
Operating System	microsoft	windows_10_20h2	-	No
Operating System	microsoft	windows_7	-	No
Operating System	microsoft	windows_8.1	-	No
Operating System	microsoft	windows_rt_8.1	-	No
Operating System	microsoft	windows_server_1909	-	No
Operating System	microsoft	windows_server_2004	-	No
Operating System	microsoft	windows_server_2008	-	No
Operating System	microsoft	windows_server_2008	r2	No
Operating System	microsoft	windows_server_2012	-	No
Operating System	microsoft	windows_server_2012	r2	No
Operating System	microsoft	windows_server_2016	-	No
Operating System	microsoft	windows_server_2019	-	No
Operating System	microsoft	windows_server_20h2	-	No
Application	microsoft	security_essentials	-	Yes
Application	microsoft	system_center_endpoint_protection	-	Yes
Application	microsoft	system_center_endpoint_protection	2012	Yes
Application	microsoft	system_center_endpoint_protection	2012	Yes

References

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

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For microsoft's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.