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CVE-2021-21973

MediumPublished

VMware vCenter Server and Cloud Foundation Server Side Request Forgery (SSRF) Vulnerability

Published: Feb 24, 2021
Updated: Oct 21, 2025
Assigning CNA: vmware
Evidence observed: Mar 7, 2022

Primary CVSS

5.3/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

87.6%

High · next 30 days

Percentile: 99.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

The vSphere Client (HTML5) contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue by sending a POST request to vCenter Server plugin leading to information disclosure. 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).

Sources

CVE-2021-21973-AutomatemeExploit
Automated exploit for CVE-2021-21973, targeting a VMware vCenter Server arbitrary file read vulnerability for penetration testing and security assessment.

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