Vulnerability Details : CVE-2021-21985

Public exploit exists!
Used for ransomware!
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.
Published 2021-05-26 15:15:08
Updated 2021-09-14 17:37:25
Source VMware
View at NVD,   CVE.org
Vulnerability category: Input validationExecute code

CVE-2021-21985 is in the CISA Known Exploited Vulnerabilities Catalog

This issue is known to have been leveraged as part of a ransomware campaign.
CISA vulnerability name:
VMware vCenter Server Improper Input Validation Vulnerability
CISA required action:
Apply updates per vendor instructions.
CISA description:
VMware vSphere Client contains an improper input validation vulnerability in the Virtual SAN Health Check plug-in, which is enabled by default in vCenter Server, which allows for remote code execution.
Added on 2021-11-03 Action due date 2021-11-17

Exploit prediction scoring system (EPSS) score for CVE-2021-21985

Probability of exploitation activity in the next 30 days: 97.39%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 100 % EPSS Score History EPSS FAQ

Metasploit modules for CVE-2021-21985

  • VMware vCenter Server Virtual SAN Health Check Plugin RCE
    Disclosure Date: 2021-05-25
    First seen: 2021-07-12
    exploit/linux/http/vmware_vcenter_vsan_health_rce
    This module exploits Java unsafe reflection and SSRF in the VMware vCenter Server Virtual SAN Health Check plugin's ProxygenController class to execute code as the vsphere-ui user. See the vendor advisory for affected and patched versions. Tested a

CVSS scores for CVE-2021-21985

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
10.0
 HIGH AV:N/AC:L/Au:N/C:C/I:C/A:C
10.0
10.0
 NIST
9.8
 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.9
5.9
 NIST

CWE ids for CVE-2021-21985

  • The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-21985

Products affected by CVE-2021-21985

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