CVE-2021-21994

CriticalCVSS 9.8/10Last modified Jun 17, 2026

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.

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-287

Affected software

Vendor	Product	Versions
n/a	VMware ESXi and VMware Cloud Foundation	VMware ESXi(7.0 before ESXi70U2-17630552, 6.7 before ESXi670-202103101-SG, 6.5 before ESXi650-202107401-SG) and VMware Cloud Foundation (4.x, 3.x before 3.10.2)

References

https://www.vmware.com/security/advisories/VMSA-2021-0014.htmlVendor Advisory
https://www.vmware.com/security/advisories/VMSA-2021-0014.htmlVendor Advisory

Timeline

Published: Jul 13, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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