CVE-2021-34473 — Microsoft Exchange Server Remote Code Execution Vulnerability

CVE-2021-34473

CRITICAL · CVSS 9.1 ⚠ KEV — EXPLOITED

EPSS exploitation probability: 100%

⚠ Listed in the CISA Known Exploited Vulnerabilities catalog — actively exploited.

Published 2021-11-03 · Last modified 2026-08-10T16:17:48.873

Summary

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft — Exchange Server

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