CVE-2021-1647 on CISA KEV

Microsoft Defender Remote Code Execution Vulnerability

01What CISA says about this vulnerability

Microsoft Defender Remote Code Execution Vulnerability

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• msrc.microsoft.com — https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1647

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
Microsoft	Microsoft System Center Endpoint Protection	N/A
Microsoft	Microsoft System Center 2012 R2 Endpoint Protection	N/A
Microsoft	Microsoft Security Essentials	N/A
Microsoft	Microsoft System Center 2012 Endpoint Protection	N/A
Microsoft	Windows Defender	N/A

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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