# CVE-2021-38646

Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability

- Page: https://www.vulneraibility.com/cve/CVE-2021-38646
- CVSS: 7.8
- Known exploited: yes, in CISA KEV since 2022-03-28; CISA due date 2022-04-18; known ransomware use
- EPSS: 7.99% (percentile 94.8)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2025-02-04)
- Published: 2021-09-15

## Affected versions

- Microsoft Microsoft 365 Apps for Enterprise: affected >= 16.0.1 and < https://aka.ms/OfficeSecurityReleases
- Microsoft Microsoft Office 2013 Service Pack 1: affected >= 15.0.0 and < 5381.1000
- Microsoft Microsoft Office 2016: affected >= 16.0.0 and < 5215.1000
- Microsoft Microsoft Office 2019: affected >= 19.0.0 and < https://aka.ms/OfficeSecurityReleases

A version outside these ranges is not a statement that it is unaffected.

## References

- [patch] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38646
- [other] https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38646
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-38646

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.