CVE-2020-17128: Microsoft Excel Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 7.8)

CVSS Vector

CVSS:3.1/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

2020-Dec

Released

2020-12-08

Last Updated

2020-12-15

EPSS Score

12.66% (percentile: 94.0%)

FAQ

Is the Preview Pane an attack vector for this vulnerability? No, the Preview Pane is not an attack vector. Are the updates for the Microsoft Office 2019 for Mac currently available? The security update for Microsoft Office 2019 for Mac is not immediately available. The update will be released as soon as possible, and when it is available, customers will be notified via a revision to this CVE information.

Affected Products (18)

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 Office 2016 (32-bit edition)
• Microsoft Office 2016 (64-bit edition)
• Microsoft Excel 2010 Service Pack 2 (32-bit editions)
• Microsoft Excel 2010 Service Pack 2 (64-bit editions)
• 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 2010 Service Pack 2 (32-bit editions)
• Microsoft Office 2010 Service Pack 2 (64-bit editions)
• Microsoft Office Web Apps 2013 Service Pack 1

Security Updates (13)

• Release Notes
• 4486750
• 4486754
• 4486754
• 4486757
• 4486757
• 4493148
• 4493148
• 4493139
• 4493139
• 4493140
• 4493140
• 4486760

Acknowledgments

kdot working with Trend Micro Zero Day Initiative

Revision History

• 2020-12-08: Information published.
• 2020-12-15: Microsoft is announcing the availability of the security updates for Microsoft Office for Mac. Customers running affected Mac software should install the update for their product to be protected from this vulnerability. Customers running other Microsoft Office software do not need to take any action. See the Release Notes for more information and download links.