CVE-2021-21985

Estado: AnalizadaCrítica (9.8)⚠ Explotación activa

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.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 9.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 100%
Percentil entre todas las CVEs puntuadas: 100
Fecha de la puntuación: 29/9/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

CISA KEV — explotada activamente

Añadida al catálogo: 3/11/2021
Plazo de remediación: 17/11/2021
Uso conocido en ransomware: Known

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access95 %

RCE sin autenticación en puerto 443 (AV:N/PR:N) de vCenter Server; falta validación entrada en plugin vSAN, permitiendo ejecución comandos con privilegios del sistema operativo subyacente.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Filter Network Traffic Application Isolation and Sandboxing

Tecnologías afectadas (2)

Vmware — Cloud Foundation Vmware — Vcenter Server

CWE

CWE-918
CWE-20, CWE-470, CWE-918

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2021-21985",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-21985",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2021-05-26T00:00:00+00:00"
        }
      }
    ],
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 10,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
        },
        "acInsufInfo": false,
        "impactScore": 10,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@vmware.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "VMware vCenter Server and VMware Cloud Foundation",
          "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)"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-05-26T15:15:07.937",
  "references": [
    {
      "url": "http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "security@vmware.com"
    },
    {
      "url": "http://packetstormsecurity.com/files/163487/VMware-vCenter-Server-Virtual-SAN-Health-Check-Remote-Code-Execution.html",
      "tags": [
        "Exploit",
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "security@vmware.com"
    },
    {
      "url": "https://www.vmware.com/security/advisories/VMSA-2021-0010.html",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@vmware.com"
    },
    {
      "url": "http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://packetstormsecurity.com/files/163487/VMware-vCenter-Server-Virtual-SAN-Health-Check-Remote-Code-Execution.html",
      "tags": [
        "Exploit",
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.vmware.com/security/advisories/VMSA-2021-0010.html",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21985",
      "tags": [
        "US Government Resource"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ]
    },
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        },
        {
          "lang": "en",
          "value": "CWE-470"
        },
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ]
    }
  ],
  "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 ejecución de código remota debido a una falta de comprobación de entrada en el plugin Virtual SAN Health Check, que está habilitado por defecto en vCenter Server.&#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"
    }
  ],
  "lastModified": "2026-08-12T05:17:36.797",
  "cisaActionDue": "2021-11-17",
  "cisaExploitAdd": "2021-11-03",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "23CFE5A5-A166-4FD5-BE97-5F16DAB1EAE0"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:a:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CF7DDB0C-3C07-4B5E-8B8A-0542FEE72877"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:b:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1DD16169-A7DF-4604-888C-156A60018E32"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:c:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "46FC9F34-C8FA-4AFE-9F4A-7CF9516BD4D9"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:d:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D26534EB-327B-4ED6-A3E1-005552CB1F9D"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:e:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "786CDD50-7E18-4437-8DB9-2D0ADECD436E"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:f:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B2CE8DAE-0E78-4004-983D-1ECD8855EC33"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7E51F433-1152-4E94-AF77-970230B1A574"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update1b:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0064D104-E0D8-481A-9029-D3726A1A9CF4"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update1c:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9B4D3F61-6CD9-411F-A205-EB06A57EBB4E"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update1d:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F72A1E9C-F960-4E8C-A46C-B38209E6349E"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update1e:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2C33CE46-F529-4EA9-9344-6ED3BFA7019D"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update1g:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9F1D8161-0E02-45C9-BF61-14799AB65E03"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1F2CB1FF-6118-4875-945D-07BAA3A21FFA"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update2b:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1AEDA28A-5C8E-4E95-A377-3BE530DBEAB5"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update2c:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BDDC6510-3116-4578-80C8-8EF044A8370A"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update2d:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8678DB48-CB98-4E4C-ADE6-CABA73265FEC"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update2g:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DBD9A341-1FBF-4E04-848B-550DEB27261A"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4955663C-1BB6-4F3E-9D4B-362DF144B7F1"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update3d:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CE0F8453-3D6C-4F1C-9167-3F02E3D905DC"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update3f:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0EAD4045-A7F9-464F-ABB9-3782941162CC"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update3k:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2F0A79C2-33AE-40C5-A853-770A4C691F29"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.5:update3n:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D8BB6CBC-11D6-40A4-ABAF-53AB9BED5A73"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E456F84C-A86E-4EA9-9A3E-BEEA662136E6"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:a:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5241C282-A02B-44B2-B6CA-BA3A99F9737C"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:b:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "04A60AC7-C2EA-4DBF-9743-54D708584AFA"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:d:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8A91B0C4-F184-459E-AFD3-DE0E351CC964"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "23253631-2655-48A8-9B00-CB984232329C"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update1b:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "50C2A9A8-0E66-4702-BCD4-74622108E7A6"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EE4D3E2A-C32D-408F-B811-EF8BC86F0D34"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update2a:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "31CA7802-D78D-4BAD-A45A-68B601C010C6"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update2c:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3B98981B-4721-4752-BAB4-361DB5AEB86F"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "04487105-980A-4943-9360-4442BF0411E6"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3a:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "24D24E06-EB3F-4F11-849B-E66757B01466"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3b:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8AF12716-88E2-44B5-ACD7-BCBECA130FB8"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3f:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3352212C-E820-47B3-BDF5-57018F5B9E81"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3g:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6436ADFD-6B94-4D2A-B09B-CED4EC6CA276"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3j:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D06832CE-F946-469D-B495-6735F18D02A0"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3l:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "726AC46D-9EA8-4FE8-94B8-0562935458F2"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:6.7:update3m:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0243D22F-1591-4A95-A7FE-2658CEE0C08F"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5FA81CCD-A05E-498C-820E-21980E92132F"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:a:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0EE83406-A3D9-4F75-A1A6-63831CEBEEC1"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:b:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FB563627-C9CF-4D8A-B882-9AB65EAE9E15"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:c:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DCA03B2A-48B2-48AD-B8EB-9D7BB2016819"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:d:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A2392D0F-D7A2-4E01-9212-1BA6C895AEBF"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:update1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6D731C1A-9FE5-461C-97E2-6F45E4CBABE1"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:update1a:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8725E544-2A94-4829-A683-1ECCE57A74A6"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:update1c:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0FC6765A-6584-45A8-9B21-4951D2EA8939"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:update1d:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "85DD238C-EF73-44F0-928E-A94FF5C4B378"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:update2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F4CA36C1-732E-41AE-B847-F7411B753F3D"
            },
            {
              "criteria": "cpe:2.3:a:vmware:vcenter_server:7.0:update2a:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0DA882B6-D811-4E4B-B614-2D48F0B9036E"
            }
          ],
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:vmware:cloud_foundation:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B0E65D7D-C5C1-4F9B-A470-2B1E34D2C429",
              "versionEndExcluding": "3.10.2.1",
              "versionStartIncluding": "3.0"
            },
            {
              "criteria": "cpe:2.3:a:vmware:cloud_foundation:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CDD049DD-5223-42EA-BCBF-DC86C2A90D41",
              "versionEndExcluding": "4.2.1",
              "versionStartIncluding": "4.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@vmware.com",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "VMware vCenter Server Improper Input Validation Vulnerability"
}