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CVE-2021-27657

Estado: ModificadaAlta (8.8)—

Successful exploitation of this vulnerability could give an authenticated Metasys user an unintended level of access to the server file system, allowing them to access or modify system files by sending specifically crafted web messages to the Metasys system. This issue affects: Johnson Controls Metasys version 11.0 and prior versions.

CVSS

Probabilidad de explotación (EPSS)

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).

Tecnologías afectadas (1)

Johnsoncontrols — Metasys

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-27657",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "productsecurity@jci.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "productsecurity@jci.com",
      "affectedData": [
        {
          "vendor": "Johnson Controls",
          "product": "Metasys",
          "versions": [
            {
              "status": "affected",
              "version": "11.0",
              "versionType": "custom",
              "lessThanOrEqual": "11.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-06-04T15:15:07.517",
  "references": [
    {
      "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-159-01",
      "tags": [
        "Third Party Advisory",
        "US Government Resource"
      ],
      "source": "productsecurity@jci.com"
    },
    {
      "url": "https://us-cert.gov/ics/advisories",
      "tags": [
        "Third Party Advisory",
        "US Government Resource"
      ],
      "source": "productsecurity@jci.com"
    },
    {
      "url": "https://www.johnsoncontrols.com/cyber-solutions/security-advisories",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "productsecurity@jci.com"
    },
    {
      "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-159-01",
      "tags": [
        "Third Party Advisory",
        "US Government Resource"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://us-cert.gov/ics/advisories",
      "tags": [
        "Third Party Advisory",
        "US Government Resource"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.johnsoncontrols.com/cyber-solutions/security-advisories",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "productsecurity@jci.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-269"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-269"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Successful exploitation of this vulnerability could give an authenticated Metasys user an unintended level of access to the server file system, allowing them to access or modify system files by sending specifically crafted web messages to the Metasys system. This issue affects: Johnson Controls Metasys version 11.0 and prior versions."
    },
    {
      "lang": "es",
      "value": "Una explotación con éxito de esta vulnerabilidad podría otorgar a un usuario autenticado de Metasys un nivel de acceso no intencionado al sistema de archivos del servidor, permitiéndole acceder o modificar los archivos del sistema mediante el envío de mensajes web específicamente diseñados para el sistema Metasys. Este problema afecta: Johnson Controls Metasys versiones 11.0 y versiones anteriores"
    }
  ],
  "lastModified": "2026-06-17T03:45:18.450",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:johnsoncontrols:metasys:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D5F7AFA8-0BE3-4B4E-BECA-7A51700003CD",
              "versionEndIncluding": "11.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "productsecurity@jci.com"
}