FKIE_CVE-2021-21985
Vulnerability from fkie_nvd - Published: 2021-05-26 15:15 - Updated: 2026-08-12 05:17
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 (Critical) - CVSS:3.1/
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.
References
Impacted products
{
"affected": [
{
"affectedData": [
{
"product": "VMware vCenter Server and VMware Cloud Foundation",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "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)"
}
]
}
],
"source": "security@vmware.com"
}
],
"cisaActionDue": "2021-11-17",
"cisaExploitAdd": "2021-11-03",
"cisaRequiredAction": "Apply updates per vendor instructions.",
"cisaVulnerabilityName": "VMware vCenter Server Improper Input Validation Vulnerability",
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:-:*:*:*:*:*:*",
"matchCriteriaId": "23CFE5A5-A166-4FD5-BE97-5F16DAB1EAE0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:a:*:*:*:*:*:*",
"matchCriteriaId": "CF7DDB0C-3C07-4B5E-8B8A-0542FEE72877",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:b:*:*:*:*:*:*",
"matchCriteriaId": "1DD16169-A7DF-4604-888C-156A60018E32",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:c:*:*:*:*:*:*",
"matchCriteriaId": "46FC9F34-C8FA-4AFE-9F4A-7CF9516BD4D9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:d:*:*:*:*:*:*",
"matchCriteriaId": "D26534EB-327B-4ED6-A3E1-005552CB1F9D",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:e:*:*:*:*:*:*",
"matchCriteriaId": "786CDD50-7E18-4437-8DB9-2D0ADECD436E",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:f:*:*:*:*:*:*",
"matchCriteriaId": "B2CE8DAE-0E78-4004-983D-1ECD8855EC33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update1:*:*:*:*:*:*",
"matchCriteriaId": "7E51F433-1152-4E94-AF77-970230B1A574",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update1b:*:*:*:*:*:*",
"matchCriteriaId": "0064D104-E0D8-481A-9029-D3726A1A9CF4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update1c:*:*:*:*:*:*",
"matchCriteriaId": "9B4D3F61-6CD9-411F-A205-EB06A57EBB4E",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update1d:*:*:*:*:*:*",
"matchCriteriaId": "F72A1E9C-F960-4E8C-A46C-B38209E6349E",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update1e:*:*:*:*:*:*",
"matchCriteriaId": "2C33CE46-F529-4EA9-9344-6ED3BFA7019D",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update1g:*:*:*:*:*:*",
"matchCriteriaId": "9F1D8161-0E02-45C9-BF61-14799AB65E03",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update2:*:*:*:*:*:*",
"matchCriteriaId": "1F2CB1FF-6118-4875-945D-07BAA3A21FFA",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update2b:*:*:*:*:*:*",
"matchCriteriaId": "1AEDA28A-5C8E-4E95-A377-3BE530DBEAB5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update2c:*:*:*:*:*:*",
"matchCriteriaId": "BDDC6510-3116-4578-80C8-8EF044A8370A",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update2d:*:*:*:*:*:*",
"matchCriteriaId": "8678DB48-CB98-4E4C-ADE6-CABA73265FEC",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update2g:*:*:*:*:*:*",
"matchCriteriaId": "DBD9A341-1FBF-4E04-848B-550DEB27261A",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update3:*:*:*:*:*:*",
"matchCriteriaId": "4955663C-1BB6-4F3E-9D4B-362DF144B7F1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update3d:*:*:*:*:*:*",
"matchCriteriaId": "CE0F8453-3D6C-4F1C-9167-3F02E3D905DC",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update3f:*:*:*:*:*:*",
"matchCriteriaId": "0EAD4045-A7F9-464F-ABB9-3782941162CC",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update3k:*:*:*:*:*:*",
"matchCriteriaId": "2F0A79C2-33AE-40C5-A853-770A4C691F29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update3n:*:*:*:*:*:*",
"matchCriteriaId": "D8BB6CBC-11D6-40A4-ABAF-53AB9BED5A73",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:-:*:*:*:*:*:*",
"matchCriteriaId": "E456F84C-A86E-4EA9-9A3E-BEEA662136E6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:a:*:*:*:*:*:*",
"matchCriteriaId": "5241C282-A02B-44B2-B6CA-BA3A99F9737C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:b:*:*:*:*:*:*",
"matchCriteriaId": "04A60AC7-C2EA-4DBF-9743-54D708584AFA",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:d:*:*:*:*:*:*",
"matchCriteriaId": "8A91B0C4-F184-459E-AFD3-DE0E351CC964",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update1:*:*:*:*:*:*",
"matchCriteriaId": "23253631-2655-48A8-9B00-CB984232329C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update1b:*:*:*:*:*:*",
"matchCriteriaId": "50C2A9A8-0E66-4702-BCD4-74622108E7A6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update2:*:*:*:*:*:*",
"matchCriteriaId": "EE4D3E2A-C32D-408F-B811-EF8BC86F0D34",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update2a:*:*:*:*:*:*",
"matchCriteriaId": "31CA7802-D78D-4BAD-A45A-68B601C010C6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update2c:*:*:*:*:*:*",
"matchCriteriaId": "3B98981B-4721-4752-BAB4-361DB5AEB86F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3:*:*:*:*:*:*",
"matchCriteriaId": "04487105-980A-4943-9360-4442BF0411E6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3a:*:*:*:*:*:*",
"matchCriteriaId": "24D24E06-EB3F-4F11-849B-E66757B01466",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3b:*:*:*:*:*:*",
"matchCriteriaId": "8AF12716-88E2-44B5-ACD7-BCBECA130FB8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3f:*:*:*:*:*:*",
"matchCriteriaId": "3352212C-E820-47B3-BDF5-57018F5B9E81",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3g:*:*:*:*:*:*",
"matchCriteriaId": "6436ADFD-6B94-4D2A-B09B-CED4EC6CA276",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3j:*:*:*:*:*:*",
"matchCriteriaId": "D06832CE-F946-469D-B495-6735F18D02A0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3l:*:*:*:*:*:*",
"matchCriteriaId": "726AC46D-9EA8-4FE8-94B8-0562935458F2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3m:*:*:*:*:*:*",
"matchCriteriaId": "0243D22F-1591-4A95-A7FE-2658CEE0C08F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:-:*:*:*:*:*:*",
"matchCriteriaId": "5FA81CCD-A05E-498C-820E-21980E92132F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:a:*:*:*:*:*:*",
"matchCriteriaId": "0EE83406-A3D9-4F75-A1A6-63831CEBEEC1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:b:*:*:*:*:*:*",
"matchCriteriaId": "FB563627-C9CF-4D8A-B882-9AB65EAE9E15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:c:*:*:*:*:*:*",
"matchCriteriaId": "DCA03B2A-48B2-48AD-B8EB-9D7BB2016819",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:d:*:*:*:*:*:*",
"matchCriteriaId": "A2392D0F-D7A2-4E01-9212-1BA6C895AEBF",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:update1:*:*:*:*:*:*",
"matchCriteriaId": "6D731C1A-9FE5-461C-97E2-6F45E4CBABE1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:update1a:*:*:*:*:*:*",
"matchCriteriaId": "8725E544-2A94-4829-A683-1ECCE57A74A6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:update1c:*:*:*:*:*:*",
"matchCriteriaId": "0FC6765A-6584-45A8-9B21-4951D2EA8939",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:update1d:*:*:*:*:*:*",
"matchCriteriaId": "85DD238C-EF73-44F0-928E-A94FF5C4B378",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:update2:*:*:*:*:*:*",
"matchCriteriaId": "F4CA36C1-732E-41AE-B847-F7411B753F3D",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:update2a:*:*:*:*:*:*",
"matchCriteriaId": "0DA882B6-D811-4E4B-B614-2D48F0B9036E",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:vmware:cloud_foundation:*:*:*:*:*:*:*:*",
"matchCriteriaId": "B0E65D7D-C5C1-4F9B-A470-2B1E34D2C429",
"versionEndExcluding": "3.10.2.1",
"versionStartIncluding": "3.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:vmware:cloud_foundation:*:*:*:*:*:*:*:*",
"matchCriteriaId": "CDD049DD-5223-42EA-BCBF-DC86C2A90D41",
"versionEndExcluding": "4.2.1",
"versionStartIncluding": "4.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
},
{
"lang": "es",
"value": "VSphere Client (HTML5) contiene una vulnerabilidad de ejecuci\u00f3n de c\u00f3digo remota debido a una falta de comprobaci\u00f3n de entrada en el plugin Virtual SAN Health Check, que est\u00e1 habilitado por defecto en vCenter Server.\u0026#xa0;Un actor malicioso con acceso de red al puerto 443 puede explotar este problema para ejecutar comandos con privilegios ilimitados en el sistema operativo subyacente que aloja a vCenter Server"
}
],
"id": "CVE-2021-21985",
"lastModified": "2026-08-12T05:17:36.797",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "HIGH",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 10.0,
"confidentialityImpact": "COMPLETE",
"integrityImpact": "COMPLETE",
"vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 10.0,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2021-21985",
"options": [
{
"exploitation": "active"
},
{
"automatable": "yes"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2021-05-26T00:00:00+00:00",
"version": "2.0.3"
}
}
]
},
"published": "2021-05-26T15:15:07.937",
"references": [
{
"source": "security@vmware.com",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"url": "http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html"
},
{
"source": "security@vmware.com",
"tags": [
"Exploit",
"Third Party Advisory",
"VDB Entry"
],
"url": "http://packetstormsecurity.com/files/163487/VMware-vCenter-Server-Virtual-SAN-Health-Check-Remote-Code-Execution.html"
},
{
"source": "security@vmware.com",
"tags": [
"Vendor Advisory"
],
"url": "https://www.vmware.com/security/advisories/VMSA-2021-0010.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"url": "http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Exploit",
"Third Party Advisory",
"VDB Entry"
],
"url": "http://packetstormsecurity.com/files/163487/VMware-vCenter-Server-Virtual-SAN-Health-Check-Remote-Code-Execution.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "https://www.vmware.com/security/advisories/VMSA-2021-0010.html"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"tags": [
"US Government Resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21985"
}
],
"sourceIdentifier": "security@vmware.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-918"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-20"
},
{
"lang": "en",
"value": "CWE-470"
},
{
"lang": "en",
"value": "CWE-918"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…