CVE-2021-42309: Microsoft SharePoint Server Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/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

0.55% (percentile: 68.1%)

FAQ

According to the CVSS metric, privileges required is low (PR:L). What does that mean for this vulnerability? The attacker must be authenticated to the target site, with the permission to use Manage Lists within SharePoint.

Affected Products (4)

Microsoft Office

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

Security Updates (4)

• 5002055
• 5002054
• 5002045
• 5002071

Acknowledgments

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

Revision History

• 2021-12-14: Information published.