CVE-2021-21994

9.8 criticalEPSS 1.2%

Critical (9.8) in vmware. EPSS 1.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 1.2% chance of exploitation in the next 30 days; higher than 67% of CVEs (scores of 2026-10-31)
CWE: CWE-287
Published: 2021-07-13
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

vmware:cloud_foundation
vmware:esxi

References

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

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