VULNERABILITY INTELLIGENCE

CVE-2021-21986

CVSS score9.8 CRITICAL

EPSS probability13.26%

CISA KEVNot currently listed

Published2021-05-26

Last modified2026-06-17

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

Description

The vSphere Client (HTML5) contains a vulnerability in a vSphere authentication mechanism for the Virtual SAN Health Check, Site Recovery, vSphere Lifecycle Manager, and VMware Cloud Director Availability plug-ins. A malicious actor with network access to port 443 on vCenter Server may perform actions allowed by the impacted plug-ins without authentication.

Weakness classification

nvd@nist.gov: CWE-306

Primary references

security@vmware.com — Third Party Advisory, VDB Entry
security@vmware.com — Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory