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

Vulnerability from cvelistv5 – Published: 2021-02-24 16:42 – Updated: 2025-10-21 23:25
VLAI CISA Shadowserver KEVIntel
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
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • Remote code execution vulnerability
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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
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: 2026-02-06 07:17 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0f2f5ac1-72e6-4757-880f-d0b3a4fcfd09

Vulnerability ID: CVE-2021-21972

Status: Confirmed

Status Updated: 2026-07-09 00:00 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2023-10-17
Asserted: 2023-10-17
Last Seen: 2026-07-09
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: VMWare / vCenter Server | Class: other-software | Severity: Critical (CVSS 9.8) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-07-09: 1
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class other-software
7D Avg 0
Vendor VMWare
30D Avg 0
90D Avg 0
Product vCenter Server
Cisa Kev yes
Connections 1
Observation Date 2026-07-09
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical
References
Created: 2026-06-30 09:24 UTC | Updated: 2026-07-11 01:01 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 7c062cb1-61f7-44bf-a1d2-81f8a881db53

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: KEVIntel entry: The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin. A malicious actor with network access to port... | Affected: VMware / VMware vCenter Server, VMware Cloud Foundation | CVSS: 9.8 (CRITICAL) | Used in malware: yes | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin. A malicious actor with network access to port...
Vendor VMware
Product VMware vCenter Server, VMware Cloud Foundation
Added Date 2021-11-03T00:00:00.000Z
Cvss Score 9.8
Epss Score None
Cvss Severity CRITICAL
Epss Percentile None
Used In Malware yes
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:04 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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      "descriptions": "[{\"lang\": \"en\", \"value\": \"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).\"}, {\"lang\": \"es\", \"value\": \"El VSphere Client (HTML5) contiene una vulnerabilidad de ejecuci\\u00f3n de c\\u00f3digo remota en un plugin de vCenter Server.\u0026#xa0;Un actor malicioso con acceso de red al puerto 443 puede explotar este problema para ejecutar comandos con privilegios no restringidos en el sistema operativo subyacente que aloja vCenter Server.\u0026#xa0;Esto afecta a VMware vCenter Server (versiones 7.x anteriores a 7.0 U1c, versiones 6.7 anteriores a 6.7 U3l y versiones 6.5 anteriores a 6.5 U3n) y VMware Cloud Foundation (versiones 4.x anteriores a 4.2 y versiones 3.x anteriores a 3.10.1.2)\"}]",
      "id": "CVE-2021-21972",
      "lastModified": "2024-11-21T05:49:20.893",
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      "published": "2021-02-24T17:15:15.833",
      "references": "[{\"url\": \"http://packetstormsecurity.com/files/161590/VMware-vCenter-Server-7.0-Arbitrary-File-Upload.html\", \"source\": \"security@vmware.com\", \"tags\": [\"Exploit\", \"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"http://packetstormsecurity.com/files/161695/VMware-vCenter-Server-File-Upload-Remote-Code-Execution.html\", \"source\": \"security@vmware.com\", \"tags\": [\"Exploit\", \"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"http://packetstormsecurity.com/files/163268/VMware-vCenter-6.5-6.7-7.0-Remote-Code-Execution.html\", \"source\": \"security@vmware.com\", \"tags\": [\"Exploit\", \"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"https://www.vmware.com/security/advisories/VMSA-2021-0002.html\", \"source\": \"security@vmware.com\", \"tags\": [\"Vendor Advisory\"]}, {\"url\": \"http://packetstormsecurity.com/files/161590/VMware-vCenter-Server-7.0-Arbitrary-File-Upload.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Exploit\", \"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"http://packetstormsecurity.com/files/161695/VMware-vCenter-Server-File-Upload-Remote-Code-Execution.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Exploit\", \"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"http://packetstormsecurity.com/files/163268/VMware-vCenter-6.5-6.7-7.0-Remote-Code-Execution.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Exploit\", \"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"https://www.vmware.com/security/advisories/VMSA-2021-0002.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Vendor Advisory\"]}]",
      "sourceIdentifier": "security@vmware.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-22\"}]}]"
    },
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}



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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.