Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability

HIGH 7.8EXPLOITED (CISA KEV)CVE-2021-38646 · Published 15/09/2021 · updated 10/08/2026

Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 28/03/2022. Patch affected systems as an emergency. It is known to be used in ransomware campaigns.

Package	Affected versions	Patched versions
office microsoft	`= 2013`	No fix yet

Description

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38646 · Patch
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38646 · Patch
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2021-38646

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