CVE-2021-21974: VMware Cloud Foundation

High severity, CVSS 8.8. EPSS: 45.1% chance of exploitation in the next 30 days.

OpenSLP as used in ESXi (7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG) has a heap-overflow vulnerability. A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue in OpenSLP service resulting in remote code execution.

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 ESXi: version 6.5 only; version 6.7 only; version 7.0.0 only

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