CVE-2021-21985

CriticalCVSS 9.8/10Known exploited (CISA KEV)Last modified Aug 12, 2026

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-918 CWE-20 CWE-470

Affected software

No affected versions have been published.

Timeline

Published: May 26, 2021
Last modified: Aug 12, 2026
Added to CISA KEV: Nov 3, 2021
NVD status: Analyzed

Related CVEs from 2021

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