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CVE-2021-21985

CRITICALCISA KEV

9.8

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.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published5/26/2021

Last Modified10/30/2025

Sourcekev

Honeypot Sightings0

CISA KEV

VendorVMware

ProductvCenter Server

Vulnerability NameVMware vCenter Server Improper Input Validation Vulnerability

KEV Date Added2021-11-03

Remediation Due Date2021-11-17

Ransomware UseKnown

Affected Products

vmware:cloud_foundationvmware:vcenter_server

Weaknesses (CWE)

CWE-918CWE-20CWE-470CWE-918

References

http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html(security@vmware.com)

http://packetstormsecurity.com/files/163487/VMware-vCenter-Server-Virtual-SAN-Health-Check-Remote-Code-Execution.html(security@vmware.com)

https://www.vmware.com/security/advisories/VMSA-2021-0010.html(security@vmware.com)

http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html(af854a3a-2127-422b-91ae-364da2661108)

http://packetstormsecurity.com/files/163487/VMware-vCenter-Server-Virtual-SAN-Health-Check-Remote-Code-Execution.html(af854a3a-2127-422b-91ae-364da2661108)

https://www.vmware.com/security/advisories/VMSA-2021-0010.html(af854a3a-2127-422b-91ae-364da2661108)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21985(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.