CVE-2023-21763: Microsoft Exchange Server Elevation of Privilege Vulnerability

Overview

Severity

High (CVSS 7.8)

CVSS Vector

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

Category

Elevation of Privilege

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2023-Jan

Released

2023-01-10

EPSS Score

0.48% (percentile: 65.2%)

FAQ

What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Affected Products (3)

Server Software

• Microsoft Exchange Server 2019 Cumulative Update 11
• Microsoft Exchange Server 2019 Cumulative Update 12
• Microsoft Exchange Server 2016 Cumulative Update 23

Security Updates (3)

• 5022193
• 5022193
• 5022143

Acknowledgments

Piotr Bazydlo <a href="https://www.twitter.com/chudypb">(@chudypb)</a> working with <a href="https://www.zerodayinitiative.com/">Trend Micro Zero Day Initiative</a>

Revision History

• 2023-01-10: Information published.