CVE-2021-21994

CRITICAL

VMware ESXi - Authentication Bypass via SFCB Request

Title source: llm
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 9.8
EPSS 0.0038
EPSS Percentile 59.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-287
Status published
Products (3)
vmware/cloud_foundation 3.0 - 3.10.2
vmware/cloud_foundation 4.0 - 4.3
vmware/esxi 6.5 (48 CPE variants)
Published Jul 13, 2021
Tracked Since Feb 18, 2026