CVE-2021-27059

Microsoft Office Remote Code Execution Vulnerability

Score

CVSS 3.1 7.6 High

Status

Analyzed - secure@microsoft.com

Published

2021-03-11

Last modified

2026-08-19

Known exploited (CISA KEV)

since 2021-11-03, action due 2021-11-17: Apply updates per vendor instructions.

Affected products

• Excel (Microsoft)
• Office (Microsoft)
• Office 2013 (Microsoft)
• Office 2016 (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27059
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27059
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27059