CVE-2021-21985

critical VMware ⚠️ CISA KEV — Exploited in the Wild
CVSS v3 Base Score
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score
100.0%
Exploitation probability in 30 days
Top 0% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: May 26, 2021 (1929 days ago)
Last Modified: August 12, 2026
Vendor: VMware
Source: NVD

⚠️ CISA Known Exploited Vulnerability

Added to KEV: 2021-11-03
Remediation Due: 2021-11-17 (⚠ 1754d overdue)
Ransomware Campaign: Known

Description

The vSphere Client (HTML5) contains a remote code execution vulnerability due to lack of input validation in the Virtual SAN Health Check plug-in which is enabled by default in vCenter Server. A malicious actor with network access to port 443 may exploit this issue to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server.

CWE

CWE-918

Affected Products

vmware vcenter servervmware cloud foundation

References

🔗 packetstormsecurity.com 🔗 packetstormsecurity.com 🔗 www.vmware.com 🔗 packetstormsecurity.com 🔗 packetstormsecurity.com