CVE-2021-21972 (GCVE-0-2021-21972)

Vulnerability from cvelistv5 – Published: 2021-02-24 16:42 – Updated: 2025-10-21 23:25
VLAI? CISA KEV
Summary
The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin. 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. This affects VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5 before 6.5 U3n) and VMware Cloud Foundation (4.x before 4.2 and 3.x before 3.10.1.2).
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 Affected: 7.x before 7.0 U1c
Affected: 6.7 before 6.7 U3l
Affected: 6.5 before 6.5 U3n
    n/a VMware Cloud Foundation Affected: 4.x before 4.2
Affected: 3.x before 3.10.1.2
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6dfe25d0-1f9e-4a1a-922c-d3d2eeaee3b1

Vulnerability ID: CVE-2021-21972

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 Remote Code Execution Vulnerability | Affected: VMware / vCenter Server | Description: VMware vCenter Server vSphere Client contains a remote code execution vulnerability in a vCenter Server plugin which allows an attacker with network access to port 443 to execute commands with unrestricted privileges on the underlying operating system. | 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-2021-21972
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-23
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 Remote Code Execution Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 12:29 UTC | Updated: 2026-02-02 12:29 UTC
Show details on NVD website
To clipboard 

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      "id": "CVE-2021-21972",
      "lastModified": "2024-11-21T05:49:20.893",
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      "published": "2021-02-24T17:15:15.833",
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}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.