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High7.8Microsoft Server

High [CVE-2021-40442] Microsoft Excel Remote Code Execution Vulnerability

This high-severity Microsoft Server advisory covers CVE-2021-40442 affecting Microsoft SharePoint Enterprise Server 2013 Service Pack 1.

CVE-2021-40442 Published Nov 10, 2021Updated by vendor Aug 19, 2026
CVE-2021-40442
Affected products & platforms
Microsoft ServerSharePoint Server
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Summary

Microsoft Excel Remote Code Execution Vulnerability

Affected product named by the advisory: Microsoft SharePoint Enterprise Server 2013 Service Pack 1.

Affected versions
  • Microsoft 365 Apps for Enterprise 16.0.1 before https://aka.ms/OfficeSecurityReleases
  • Microsoft Excel 2013 Service Pack 1 15.0.0.0 before 15.0.5397.1001
  • Microsoft Excel 2016 16.0.0.0 before 16.0.5239.1001
  • Microsoft Office 2019 19.0.0 before https://aka.ms/OfficeSecurityReleases
  • Microsoft Office 2019 for Mac 16.0.0 before 16.55.21111400
  • Microsoft Office LTSC 2021 16.0.1 before https://aka.ms/OfficeSecurityReleases
  • Microsoft Office LTSC for Mac 2021 16.0.1 before 16.55.21111400
  • Microsoft Office Online Server 16.0.1 before 16.0.10380.20000
  • Microsoft Office Web Apps Server 2013 Service Pack 1 15.0.1 before 15.0.5397.1001
  • Microsoft SharePoint Enterprise Server 2013 Service Pack 1 15.0.0 before 15.0.5397.1001

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Fixed versions
  • https://aka.ms/OfficeSecurityReleases
  • 15.0.5397.1001
  • 16.0.5239.1001
  • 16.55.21111400
  • 16.0.10380.20000

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Mitigation

Upgrade to a fixed release: https://aka.ms/OfficeSecurityReleases, 15.0.5397.1001, 16.0.5239.1001, 16.55.21111400, 16.0.10380.20000. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

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