Exposed dangerous method or function in Microsoft Exchange Server - CVE-2023-21529
Published: February 14, 2023 / Updated: April 13, 2026
Vulnerability identifier: #VU72174
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-21529
CWE-ID: CWE-749
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation within the MultiValuedProperty class. A remote user can send a specially crafted request and execute arbitrary code in the context of the server's account.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Microsoft Exchange Server
How to mitigate CVE-2023-21529
Install updates from vendor's website.
Microsoft Exchange Server - addressed in versions 2013 CU23 Feb23SU 15.00.1497.047, 2016 CU23 Feb23SU 15.01.2507.021, 2019 CU11 Feb23SU 15.02.0986.041, 2019 CU12 Feb23SU 15.02.1118.025