CVE Database · CVE-2021-42321
CVSS v3.1
8.8
EPSS
90.39%
Published
Nov 9, 2021
Modified
Oct 30, 2025
CISA Known Exploited Vulnerability
Added: 2021-11-17 · Due: 2021-12-01
Apply updates per vendor instructions.
Public PoC / Exploit (3)
All weaponized →Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected Products (4)
References (7)