CVE-2021-38646

CVE-2021-38646 is a high-severity (CVSS 7.8) vulnerability in Microsoft Office. CISA added it to the Known Exploited Vulnerabilities catalog on March 28, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by April 18, 2022. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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