CVE-2021-38646

High (7.8) in Microsoft Office. In CISA KEV since 2022-03-28, with known ransomware use. EPSS 8.0% chance of exploitation in the next 30 days.

EPSS

8.0% chance of exploitation in the next 30 days; higher than 94% of CVEs (scores of 2026-10-31)

CISA KEV

listed 2022-03-28, due 2022-04-18, known ransomware use

Published

2021-09-15

Modified

2026-08-10

Record from

the NVD, synced 2026-10-19

Affected

• microsoft:365_apps
• microsoft:office
• microsoft:office_2016
• microsoft:office_2019

References

• 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

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