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CVE-2018-5138

Estado: ModificadaMedia (5.3)—

Una vulnerabilidad de suplantación puede ocurrir cuando un sitio malicioso con un nombre de dominio extremadamente largo se abre en una pestaña personalizada de Android (un panel de navegador dentro de otra aplicación) y el navegador predeterminado es Firefox para Android. Esto permite que un atacante suplante la página que está en realidad cargada y en uso. Nota: este problema sólo afecta a Firefox para Android. Las demás versiones y sistemas operativos no se ven afectados. Esta vulnerabilidad afecta a las versiones anteriores a la 59 de Firefox.

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)

Mozilla — Firefox

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2018-5138",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Firefox",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
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              "versionType": "custom"
            }
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        }
      ]
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  ],
  "published": "2018-06-11T21:29:14.483",
  "references": [
    {
      "url": "http://www.securityfocus.com/bid/103386",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "security@mozilla.org"
    },
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      "url": "http://www.securitytracker.com/id/1040514",
      "tags": [
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      "source": "security@mozilla.org"
    },
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      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1432624",
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        "Vendor Advisory"
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      "source": "security@mozilla.org"
    },
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      "url": "https://www.mozilla.org/security/advisories/mfsa2018-06/",
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      "source": "security@mozilla.org"
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        "VDB Entry"
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    },
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1432624",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2018-06/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A spoofing vulnerability can occur when a malicious site with an extremely long domain name is opened in an Android Custom Tab (a browser panel inside another app) and the default browser is Firefox for Android. This could allow an attacker to spoof which page is actually loaded and in use. Note: this issue only affects Firefox for Android. Other versions and operating systems are unaffected. This vulnerability affects Firefox < 59."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de suplantación puede ocurrir cuando un sitio malicioso con un nombre de dominio extremadamente largo se abre en una pestaña personalizada de Android (un panel de navegador dentro de otra aplicación) y el navegador predeterminado es Firefox para Android. Esto permite que un atacante suplante la página que está en realidad cargada y en uso. Nota: este problema sólo afecta a Firefox para Android. Las demás versiones y sistemas operativos no se ven afectados. Esta vulnerabilidad afecta a las versiones anteriores a la 59 de Firefox."
    }
  ],
  "lastModified": "2026-06-17T01:59:41.660",
  "configurations": [
    {
      "nodes": [
        {
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              "versionEndExcluding": "59.0"
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  "sourceIdentifier": "security@mozilla.org"
}