CVE-2021-38646 on CISA KEV

Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability

01What CISA says about this vulnerability

Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• portal.msrc.microsoft.com — https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-3864…

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 Office 2019	19.0.0
Microsoft	Microsoft 365 Apps for Enterprise	16.0.1
Microsoft	Microsoft Office 2016	16.0.0
Microsoft	Microsoft Office 2013 Service Pack 1	15.0.0

06Detection

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

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