CVE-2023-21529β€”Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability

PUBLISHEDvulnerability record
2026-04-13 Β· last modified April 21, 2026

Metadata

CVE ID:
CVE-2023-21529
Project:
Microsoft
Product:
Exchange Server
Date Added:
2026-04-13
Due Date:
2026-04-27
Last Updated:
April 21, 2026

Vulnerability Name

Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability

Description

Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:
KNOWN

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.

Additional Notes

  • https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529
  • https://nvd.nist.gov/vuln/detail/CVE-2023-21529

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