CVE-2021-42294: Microsoft SharePoint Server Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 7.2)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/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-Dec

Released

2021-12-14

EPSS Score

0.95% (percentile: 76.4%)

FAQ

There are multiple update packages available for some of the affected software. Do I need to install all the updates listed in the Security Updates table for the software? Yes. Customers should apply all updates offered for the software installed on their systems. If multiple updates apply, they can be installed in any order.

Affected Products (6)

Microsoft Office

• Microsoft SharePoint Enterprise Server 2016
• Microsoft SharePoint Enterprise Server 2013 Service Pack 1
• Microsoft SharePoint Server 2019
• Microsoft SharePoint Server Subscription Edition
• SharePoint Server Subscription Edition Language Pack
• Microsoft SharePoint Foundation 2013 Service Pack 1

Security Updates (9)

• 5002055
• 5002059
• 5002008
• 5002054
• 5002061
• 5002045
• 5002047
• 5002071
• 5002015

Acknowledgments

<a href="https://twitter.com/cjm00nw">Yuhao Weng</a> & Zhiniang Peng with <a href="https://www.sangfor.com">Sangfor</a>

Revision History

• 2021-12-14: Information published.