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CVE-2021-24070: Microsoft Excel Remote Code Execution Vulnerability

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-25 · updated 2026-06-17
• Weakness: CWE-416

Description

Microsoft Excel Remote Code Execution Vulnerability

Affected products

• Microsoft 365 Apps: all versions
• Microsoft Excel 2013 Service Pack 1: 2010-sp2, 2013-sp1, 2016
• Microsoft Office: 2019
• Microsoft Office Online Server: all versions
• Microsoft Office Web Apps: 2013-sp1
• Microsoft 365 Apps: from 16.0.1 before https://aka.ms/OfficeSecurityReleases — fixed in https://aka.ms/OfficeSecurityReleases
• Microsoft Excel 2013 Service Pack 1: from 13.0.0.0 before publication — fixed in publication
• Microsoft Excel 2016: from 16.0.0.0 before publication — fixed in publication
• Microsoft Office Web Apps Server 2013 Service Pack 1: from 15.0.1 before publication — fixed in publication
• Microsoft Office: from 19.0.0 before https://aka.ms/OfficeSecurityReleases — fixed in https://aka.ms/OfficeSecurityReleases
• Microsoft Office Online Server: from https://aka.ms/OfficeSecurityReleases before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft 365 Apps https://aka.ms/OfficeSecurityReleases; Microsoft Excel 2013 Service Pack 1 publication; Microsoft Excel 2016 publication; Microsoft Office Web Apps Server 2013 Service Pack 1 publication; Microsoft Office https://aka.ms/OfficeSecurityReleases; Microsoft Office Online Server publication. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24070
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24070

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