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CVE-2021-27661

Estado: ModificadaAlta (8.8)—

Successful exploitation of this vulnerability could give an authenticated Facility Explorer SNC Series Supervisory Controller (F4-SNC) user an unintended level of access to the controller’s file system, allowing them to access or modify system files by sending specifically crafted web messages to the F4-SNC.

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 — F4-snc Firmware

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-27661",
  "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",
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          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
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      {
        "type": "Primary",
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  "affected": [
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      "affectedData": [
        {
          "vendor": "Johnson Controls",
          "product": "Facility Explorer SNC Series Supervisory Controllers (F4-SNC)",
          "versions": [
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              "status": "affected",
              "version": "Facility Explorer SNC Series Supervisory Controllers version 11 11"
            }
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  ],
  "published": "2021-07-01T14:15:07.847",
  "references": [
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      "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-182-01",
      "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-21-182-01",
      "tags": [
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        "US Government Resource"
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    },
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      "tags": [
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      "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-863"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Successful exploitation of this vulnerability could give an authenticated Facility Explorer SNC Series Supervisory Controller (F4-SNC) user an unintended level of access to the controller’s file system, allowing them to access or modify system files by sending specifically crafted web messages to the F4-SNC."
    },
    {
      "lang": "es",
      "value": "Una explotación con éxito de esta vulnerabilidad podría dar a un usuario autenticado del Controlador de Supervisión de la Serie SNC de Facility Explorer (F4-SNC) un nivel de acceso no deseado al sistema de archivos del controlador, permitiéndole acceder o modificar los archivos del sistema mediante el envío de mensajes web específicamente diseñados al F4-SNC."
    }
  ],
  "lastModified": "2026-06-17T03:45:18.940",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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  "sourceIdentifier": "productsecurity@jci.com"
}