[PoC] CVE-2021-42321: Microsoft Exchange Server Remote Code Execution Vulnerability Alert Vulnerability [PoC] CVE-2021-42321: Microsoft Exchange Server Remote Code Execution Vulnerability Alert Do Son November 22, 2021 CVE-2021-42321 (CVSS:3.1 of 8.8), the remote code execution vulnerability in Microsoft Exchange Server 2016 and 2019