PT-2021-3852 · Vmware · Vmware Cloud Foundation+1

Douglas Everson · Published 2021-07-13 · Updated 2025-10-31 · CVE-2021-21994

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions VMware ESXi versions (affected versions not specified) VMware Cloud Foundation versions (affected versions not specified)

Description The issue is related to an authentication bypass vulnerability in the SFCB (Small Footprint CIM Broker) service. A malicious actor with network access to port 5989 may exploit this issue by sending a specially crafted request to bypass the authentication procedure.

Recommendations For VMware ESXi, as a temporary workaround, consider restricting access to port 5989 until a patch is available. For VMware Cloud Foundation, as a temporary workaround, consider restricting access to port 5989 until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

BDU:2021-04209

CVE-2021-21994

Affected Products

Vmware Cloud Foundation

Vmware Esxi

References · 7

• https://vmware.com/security/advisories/VMSA-2021-0014.html · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04209 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-21994 · Security Note
• https://osv.dev/vulnerability/CVE-2021-21994 · Vendor Advisory
• https://t.me/cveNotify/141100 · Telegram Post
• https://ibm.com/support/pages/node/6499579 · Note
• https://t.me/cvenotify/17563 · Telegram Post