CVE-2021-42320: Microsoft SharePoint Server Spoofing Vulnerability

Overview

Severity

High (CVSS 8)

CVSS Vector

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

Category

Spoofing

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2021-Dec

Released

2021-12-14

EPSS Score

0.59% (percentile: 69.2%)

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 modify their Display Name within SharePoint.

Affected Products (3)

Microsoft Office

• Microsoft SharePoint Enterprise Server 2016
• Microsoft SharePoint Server 2019
• Microsoft SharePoint Server Subscription Edition

Security Updates (3)

• 5002055
• 5002054
• 5002045

Acknowledgments

Huynh Phuoc Hung, <a href="https://twitter.com/hph0var">@hph0var</a>

Revision History

• 2021-12-14: Information published.