CVE-2021-21994

CRITICAL

9.8

Description

SFCB (Small Footprint CIM Broker) as used in ESXi has an authentication bypass vulnerability. A malicious actor with network access to port 5989 on ESXi may exploit this issue to bypass SFCB authentication by sending a specially crafted request.

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

Published7/13/2021

Last Modified10/31/2025

Sourcenvd

Honeypot Sightings0

Affected Products

vmware:cloud_foundationvmware:esxi

Weaknesses (CWE)

CWE-287

References

https://www.vmware.com/security/advisories/VMSA-2021-0014.html(security@vmware.com)

https://www.vmware.com/security/advisories/VMSA-2021-0014.html(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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