UnratedVMware (Broadcom) Exploited CISA KEV

Unknown [CVE-2021-21972] VMware vCenter Server: The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin

This security VMware (Broadcom) advisory covers CVE-2021-21972 affecting VMware vCenter Server, VMware Cloud Foundation.

CVE-2021-21972 Published Feb 24, 2021Updated by vendor Aug 12, 2026

CVE-2021-21972

Affected products & platforms

VMware (Broadcom)vCenterCloud FoundationvSphere

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Summary

The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server.

This affects VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5 before 6.5 U3n) and VMware Cloud Foundation (4.x before 4.2 and 3.x before 3.10.1.2).

CISA Known Exploited Vulnerability

Listed:: Nov 3, 2021 · federal remediation due Nov 17, 2021
Required action:: Apply updates per vendor instructions.
Ransomware use:: Known

KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.

Affected versions

VMware vCenter Server 7.x before 7.0 U1c
VMware vCenter Server 6.7 before 6.7 U3l
VMware vCenter Server 6.5 before 6.5 U3n
VMware Cloud Foundation 4.x before 4.2
VMware Cloud Foundation 3.x before 3.10.1.2

Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.

Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source

Mitigation

The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.

Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
VMware (Broadcom)
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2021-21972 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2021-21972NVD CVE.org MITRE

Official resources

Broadcom support downloads (ESXi / vCenter patches)
Official documentation
Official upgrade documentation for vSphere (ESXi / vCenter).
VMware product lifecycle (EOL / support dates)
Release notes
Confirm your release train is still supported before planning the upgrade path.
Broadcom / VMware Security Advisories (VMSA)
Official documentation
Canonical VMSA portal — full advisory text, response matrix and fixed-version tables.
VMware docs on Broadcom TechDocs
Official documentation
Official VMware product documentation, including upgrade and patching guides.

Discussion(0)

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