CVE Database · CVE-2021-21985
CVSS v3.1
9.8
EPSS
100.00%
Published
May 26, 2021
Modified
Oct 30, 2025
CISA Known Exploited Vulnerability
Added: 2021-11-03 · Due: 2021-11-17
Apply updates per vendor instructions.
Public PoC / Exploit (10)
All weaponized →Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.
Description
The vSphere Client (HTML5) contains a remote code execution vulnerability due to lack of input validation in the Virtual SAN Health Check plug-in which is enabled by default in vCenter Server. A malicious actor with network access to port 443 may exploit this issue to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server.
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWeaknesses (CWE)
Affected Products (53)
References (7)
...and 3 more