CVE Feed

    Dashboard / CVE / CVE-2021-21994

    CVE-2021-21994

    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.

    Published:Jul 13, 2021
    Last Modified:Oct 31, 2025
    EPS:Jul 13, 2021
    EPSS Score:0.00238
    CVSS Score:9.8

    Affected Products

    Vendor
    Vmware
    Product
    Cloud Foundation
    Vendor
    Vmware
    Product
    Esxi

    Exploits

    https://github.com/mreza-en/cve-2021-21994_POC

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Related CVEs

    CVE-2026-41709 (CVSS 2.7) — VMware ESX contains an insufficient logging vulnerability. A malicious administrator could exploit this issue …
    CVE-2026-41703 (CVSS 7.6) — VMware ESX, Workstation, and Fusion contain an out-of-bounds read vulnerability. A malicious actor with VM dep…
    CVE-2026-47876 (CVSS 9.3) — VMware ESX contains an out-of-bounds write vulnerability in the VMXNET3 virtual network adapter. A malicious a…
    CVE-2026-59309 (CVSS 9.8) — VMware vCenter contains an authentication bypass vulnerability in the VMware Directory Service. A malicious ac…
    CVE-2026-59310 (CVSS 9.8) — VMware vCenter contains a directory traversal vulnerability in the Syslog server. A malicious actor with netwo…
    CVE-2026-41724 (CVSS 8) — VMware Cloud Foundation Operations contains multiple stored cross-site scripting vulnerabilities.A malicious a…
    CVE-2026-41723 (CVSS 8) — VMware Cloud Foundation Operations contains multiple stored cross-site scripting vulnerabilities.A malicious a…
    CVE-2026-41722 (CVSS 8) — VMware Cloud Foundation Operations contains multiple stored cross-site scripting vulnerabilities.A malicious a…
    CVE-2026-22721 (CVSS 6.2) — VMware Aria Operations contains a privilege escalation vulnerability. A malicious actor with privileges in vCe…
    CVE-2026-22720 (CVSS 8) — VMware Aria Operations contains a stored cross-site scripting vulnerability. A malicious actor with privileges…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High