CVE-2021-21985 (GCVE-0-2021-21985)

Vulnerability from cvelistv5 – Published: 2021-05-26 14:04 – Updated: 2025-10-21 23:25
VLAI CISA KEV
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • Remote code execution vulnerability
Assigner
References
Impacted products
Vendor Product Version
n/a VMware vCenter Server and VMware Cloud Foundation Affected: 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)
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8fa6c497-5fe7-4257-87b7-2c7509f2a4ff

Vulnerability ID: CVE-2021-21985

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: VMware vCenter Server Improper Input Validation Vulnerability | Affected: VMware / vCenter Server | 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. | Required action: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-21985
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-20 CWE-470 CWE-918
Feed CISA Known Exploited Vulnerabilities Catalog
Product vCenter Server
Due Date 2021-11-17
Date Added 2021-11-03
Vendorproject VMware
Vulnerabilityname VMware vCenter Server Improper Input Validation Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 12:29 UTC | Updated: 2026-02-06 07:17 UTC
Show details on NVD website
To clipboard 

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      "id": "CVE-2021-21985",
      "lastModified": "2024-11-21T05:49:22.407",
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      "published": "2021-05-26T15:15:07.937",
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      "sourceIdentifier": "security@vmware.com",
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}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.