CVE-2021-21991: VMware Cloud Foundation

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

The vCenter Server contains a local privilege escalation vulnerability due to the way it handles session tokens. A malicious actor with non-administrative user access on vCenter Server host may exploit this issue to escalate privileges to Administrator on the vSphere Client (HTML5) or vCenter Server vSphere Web Client (FLEX/Flash).

Affected products

• VMware Cloud Foundation: from 3.0, before 3.10.2.2 (fixed in 3.10.2.2); from 4.0, before 4.3 (fixed in 4.3)
• VMware vCenter Server: version 6.5 only; version 6.7 only; version 7.0 only

Published 2021-09-22. Last modified 2026-06-17.