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CVE-2021-21986

CRITICAL
9.8
CVSS Score
Published: May 26, 2021 at 02:04 PM UTC
Updated: June 17, 2026 at 03:36 AM UTC
2 products affected across 1 vendorCloud FoundationvCenter Server

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Severity
CRITICAL9.8
Exploit prediction
EPSS 13%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cloud Foundation· VMware
95%
v < 7.03.0 ≤ v < 3.10.2.14.0 ≤ v < 4.2.1
Affected range stops below 3.10.2.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.2.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0, so it looks safe — our inference, not a vendor statement
vCenter Server· VMware
95%
v < 7.06.56.5 a6.5 b6.5 c6.5 d6.5 e6.5 f6.5 update16.5 update1b6.5 update1c6.5 update1d6.5 update1e6.5 update1g6.5 update26.5 update2b6.5 update2c6.5 update2d6.5 update2g6.5 update36.5 update3d6.5 update3f6.5 update3k6.5 update3n6.76.7 a6.7 b6.7 d6.7 update16.7 update1b6.7 update26.7 update2a6.7 update2c6.7 update36.7 update3a6.7 update3b6.7 update3f6.7 update3g6.7 update3j6.7 update3l6.7 update3m7.07.0 a7.0 b7.0 c7.0 d7.0 update17.0 update1a7.0 update1c7.0 update1d7.0 update27.0 update2a
Affected range stops below 7.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCThird Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.vmware.com/security/advisories/VMSA-2021-0010.html

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-306

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