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CISA Known Exploited Vulnerability

This CVE is actively exploited in the wild. CISA mandates federal agencies to patch immediately.

CVE

CVE-2021-21985

9.8

CVSScritical

Exploitable remotely over the internet · no authentication required.

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.

Attack Vector

Network

Privileges Req.

None

User Interaction

None

vmware vcenter server and vmware cloud foundation

Updated Sep 26, 2026View on NVD →

S4E scanner

criticalProduct Based Web Vulnerabilities~10 seconds

CVE-2021-21985 Scanner

Detects 'Remote Code Execution (RCE)' vulnerability in VMware vCenter Server and VMware Cloud Foundation affects v. VMware vCenter Server (7.x before 7.0 U2b, 6.7 before 6.7 U3n, 6.5 before 6.5 U3p) and VMware Cloud Foundation (4.x before 4.2.1, 3.x before 3.10.2.1).

Used 3.1k times · 4.3k assets checked · domain, ipv4, subdomain

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