CVE-2021-40487: Microsoft SharePoint Server Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.1)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

More Likely

Patch Tuesday

2021-Oct

Released

2021-10-12

Last Updated

2021-10-19

EPSS Score

1.60% (percentile: 81.7%)

FAQ

How could an attacker exploit this vulnerability? In a network-based attack, an authenticated attacker can gain access to create a site and could execute code remotely within the SharePoint Server.

Affected Products (3)

Microsoft Office

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

Security Updates (3)

• 5002029
• 5002028
• 5002042

Acknowledgments

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

Revision History

• 2021-10-12: Information published.
• 2021-10-19: Added an acknowledgement. This is an informational change only.