CVE-2021-38655: Microsoft Excel Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 7.8)

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2021-Sep

Released

2021-09-14

EPSS Score

7.00% (percentile: 91.5%)

FAQ

Is the Preview Pane an attack vector for this vulnerability? No, the Preview Pane is not an attack vector.

Affected Products (12)

Microsoft Office

• Microsoft Office 2019 for 32-bit editions
• Microsoft Office 2019 for 64-bit editions
• Microsoft Office 2019 for Mac
• Microsoft Office Online Server
• Microsoft 365 Apps for Enterprise for 32-bit Systems
• Microsoft 365 Apps for Enterprise for 64-bit Systems
• Microsoft Excel 2016 (32-bit edition)
• Microsoft Excel 2016 (64-bit edition)
• Microsoft Excel 2013 RT Service Pack 1
• Microsoft Excel 2013 Service Pack 1 (32-bit editions)
• Microsoft Excel 2013 Service Pack 1 (64-bit editions)
• Microsoft Office Web Apps Server 2013 Service Pack 1

Security Updates (7)

• Release Notes
• 5001999
• 5002003
• 5002003
• 5002014
• 5002014
• 5002009

Acknowledgments

kdot working with <a href="https://www.zerodayinitiative.com/">Trend Micro Zero Day Initiative</a>

Revision History

• 2021-09-14: Information published.