CVE-2023-21529 — Actively Exploited: Exchange Server (Microsoft)
Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution.
| CVE ID | CVE-2023-21529 |
|---|---|
| Vendor | Microsoft |
| Product | Exchange Server |
| Vulnerability name | Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability |
| Date added | 2026-04-13 |
| Remediation due | 2026-04-27 |
| Known ransomware use | Known |
| 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. |
| Description | Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution. |
| Source | CISA Known Exploited Vulnerabilities |
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