CVE-2021-21995: VMware Cloud Foundation

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

OpenSLP as used in ESXi has a denial-of-service vulnerability due a heap out-of-bounds read issue. A malicious actor with network access to port 427 on ESXi may be able to trigger a heap out-of-bounds read in OpenSLP service resulting in a denial-of-service condition.

Affected products

• VMware Cloud Foundation: from 3.0, before 3.10.2 (fixed in 3.10.2); from 4.0, before 4.3 (fixed in 4.3)
• VMware ESXi: version 6.5 only; version 6.7 only; version 7.0 only

Published 2021-07-13. Last modified 2026-06-17.