CVE-2021-21973: VMware vCenter Server and Cloud Foundation Server Side Request Forgery (SSRF) Vulnerability

Medium severity, CVSS 5.3. Actively exploited: in CISA KEV since 2022-03-07. EPSS: 88% chance of exploitation in the next 30 days.

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).

Affected products

• VMware Cloud Foundation: from 3.0, before 3.10.1.2 (fixed in 3.10.1.2); from 4.0, before 4.2 (fixed in 4.2)
• VMware vCenter Server: version 6.5 only; version 6.7 only; version 7.0 only

Published 2021-02-24. Last modified 2026-06-17.