CVE-2023-21529 HIGH

CVE-2023-21529: Microsoft Exchange Server Remote Code Execution Vulnerability

Vendor Microsoft
Product Microsoft Exchange Server 2019 Cumulative Update 12
Weakness CWE-502 · Unsafe deserialization
KEV Status Known Exploited
Ransomware Used in campaigns
Published February 14, 2023
Last update April 14, 2026
View on NVD All CVEs

CVSS base score

8.8/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

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

What the vulnerability does

01Description

Microsoft Exchange Server Remote Code Execution Vulnerability

CISA mandated remediation

02CISA Required Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Key dates

03Disclosure timeline

February 14, 2023 CVE published
April 14, 2026 Record updated