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Vulnerabilities CVE-2021-21985

CVE-2021-21985

Medium
Open
KEV
TLP:CLEAR

VMware vCenter Server Improper Input Validation Vulnerability

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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.

Details

EPSS Score
100.00%

100th percentile

Confidence
100%
Published
May 26, 2021
Last Modified
Aug 12, 2026
CISA KEV
Date Added
Nov 3, 2021
Patch Due
Nov 17, 2021
Used in ransomware campaigns
Required Action
Apply updates per vendor instructions.
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