All vulnerabilities
CVE-2021-42292

Office: Microsoft Excel Security Feature Bypass

Microsoft OfficeApplications & CMS
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationExploited in the wildAdded to KEV 17 Nov 2021CISA KEV
Exploit odds (EPSS)43.0%Chance of exploitation activity in the next 30 days, higher than 98% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in15.0.5397.1001Also 16.0.5239.1001, 16.55.21111400CVE List
Federal deadline1 Dec 2021Remediation due date for US federal agenciesCISA KEV
CISA required actionApply updates per vendor instructions. CISA KEV

What fixes it

  • 15.0.5397.1001Microsoft Excel 2013 Service Pack 1CVE List
  • 16.0.5239.1001Microsoft Excel 2016CVE List
  • 15.0.5397.1001Microsoft Office 2013 Service Pack 1CVE List
  • 16.0.5239.1001Microsoft Office 2016CVE List
  • 16.55.21111400Microsoft Office 2019 for MacCVE List
  • 16.55.21111400Microsoft Office LTSC for Mac 2021CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 10 Nov 2021, 00:47 UTCPublishedCVE List
  2. 17 Nov 2021Added to CISA KEVCISA KEV

Description

A security feature bypass vulnerability in Microsoft Excel would allow a local user to perform arbitrary code execution.

Text from CVE List

Affected versions 9

  • Microsoft 365 Apps for Enterpriseaffected: 16.0.1 before https://aka.ms/OfficeSecurityReleasesCVE List
  • Microsoft Excel 2013 Service Pack 1affected: 15.0.0.0 before 15.0.5397.1001CVE List
  • Microsoft Excel 2016affected: 16.0.0.0 before 16.0.5239.1001CVE List
  • Microsoft Office 2013 Service Pack 1affected: 15.0.0 before 15.0.5397.1001CVE List
  • Microsoft Office 2016affected: 16.0.0 before 16.0.5239.1001CVE List
  • Microsoft Office 2019affected: 19.0.0 before https://aka.ms/OfficeSecurityReleasesCVE List
  • Microsoft Office 2019 for Macaffected: 16.0.0 before 16.55.21111400CVE List
  • Microsoft Office LTSC 2021affected: 16.0.1 before https://aka.ms/OfficeSecurityReleasesCVE List
  • Microsoft Office LTSC for Mac 2021affected: 16.0.1 before 16.55.21111400CVE List

References 4