CVE-2023-21529
KEV · RansomwareMicrosoft Exchange Server Deserialization of Untrusted Data Vulnerability
View CVE record →- Vendor / Project
- Microsoft
- Product
- Exchange Server
- Date added
- Apr 13, 2026
- Due date
- Apr 27, 2026
- Known ransomware use
- Known
- CWEs
- CWE-502
Description
Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution.
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.