CVE-2021-21986

high-risk

Published 2021-05-26

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.

Do I need to act?

1.5% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 9.8/10 Critical

NETWORK / LOW complexity

Affected Products (20)

Vcenter Server

Affected Vendors

Vmware

References (4)

Third Party Advisory http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.h...

Vendor Advisory https://www.vmware.com/security/advisories/VMSA-2021-0010.html

Third Party Advisory http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.h...

Vendor Advisory https://www.vmware.com/security/advisories/VMSA-2021-0010.html

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high-risk

Severity 32/34 · Critical

Exploitability 4/34 · Minimal

Exposure 26/34 · High