CVE-2021-21985
VMware vCenter Server Improper Input Validation Vulnerability
- Published
- May 26, 2021
- Updated
- Aug 12, 2026
- Assigning CNA
- vmware
- Evidence observed
- Nov 3, 2021
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 100.0%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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.
Sources
10- CVE-2021-21985_PoCExploit
PoC exploit and NSE scanner for CVE-2021-21985, a vCenter Server RCE vulnerability in the vSAN Health Check plugin, with manual exploitation steps and detection script.
cve-2021-21985 powershell poc
- CVE-2021-21985-CheckerScanner
CVE-2021-21985 Checker.
Responsible use
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