All vulnerabilities
CVE-2021-21985

VMware vCenter Server Improper Input Validation Vulnerability

VMware vCenter ServerContainers & cloud
Open in ThreatlineRecord JSON
CVSS
9.8Critical
ExploitationExploited in the wildAdded to KEV 3 Nov 2021. Known ransomware useCISA KEV
Exploit odds (EPSS)>99.9%Chance of exploitation activity in the next 30 days, higher than 99.9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Federal deadline17 Nov 2021Remediation due date for US federal agenciesCISA KEV
CISA required actionApply updates per vendor instructions. CISA KEV

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

  1. 25 May 2021Exploit code publicMetasploit
  2. 26 May 2021, 14:04 UTCPublishedCVE List
  3. 3 Nov 2021Added to CISA KEVCISA KEV

Public exploit code and templates 2

  • Exploit moduleVMware vCenter Server Virtual SAN Health Check Plugin RCE 25 May 2021Metasploit
  • Scanner templateVMware vSphere Client (HTML5) - Remote Code ExecutionNuclei

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

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.

Text from CVE List

Affected versions 1

  • VMware vCenter Server and VMware Cloud Foundationaffected: 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)CVE List

References 3