CVE-2021-21985
CriticalActively exploited (CISA KEV)Known to be used in ransomware campaigns
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.
SeverityCritical
CVSS9.8
Exploit probability—
Product
VMware vCenter Server
PublishedMay 26, 2021
First seenMay 26, 2021
Added to KEVNov 3, 2021
How to fix
CISA required action
Apply updates per vendor instructions.
CISA due date: Nov 17, 2021Update
- vmware cloud_foundation3.10.2.1, 4.2.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vmware vcenter_server | 6.5, 6.7, 7.0 | — |
| vmware cloud_foundation | 3.0 ≤ v < 3.10.2.1, 4.0 ≤ v < 4.2.1 | 3.10.2.1, 4.2.1 |
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