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CVE-2017-7763

Estado: ModificadaMedia (5.3)—

Las fuentes por defecto en OS X muestran algunos caracteres tibetanos como espacios en blanco. Cuando se emplean en la barra de direcciones como parte de un IDN, se pueden utilizar en ataques de suplantación de nombres de dominio. Nota: este ataque solo afecta a sistemas operativos OS X. Otros sistemas operativos no se han visto afectados. La vulnerabilidad afecta a Firefox en versiones anteriores a la 54, Firefox ESR en versiones anteriores a la 52.2 y Thunderbird en versiones anteriores a la 52.2.

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 (3)

Debian — Debian LinuxMozilla — FirefoxMozilla — Thunderbird

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2017-7763",
  "cveTags": [],
  "metrics": {
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        "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"
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        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
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        "obtainOtherPrivilege": false,
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          "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
      }
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  "affected": [
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      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Firefox",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "54",
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          "vendor": "Mozilla",
          "product": "Firefox ESR",
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  "published": "2018-06-11T21:29:08.390",
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      "tags": [
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      "source": "security@mozilla.org"
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      "tags": [
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      "source": "security@mozilla.org"
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    {
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      "source": "security@mozilla.org"
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  "vulnStatus": "Modified",
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Default fonts on OS X display some Tibetan characters as whitespace. When used in the addressbar as part of an IDN this can be used for domain name spoofing attacks. Note: This attack only affects OS X operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2."
    },
    {
      "lang": "es",
      "value": "Las fuentes por defecto en OS X muestran algunos caracteres tibetanos como espacios en blanco. Cuando se emplean en la barra de direcciones como parte de un IDN, se pueden utilizar en ataques de suplantación de nombres de dominio. Nota: este ataque solo afecta a sistemas operativos OS X. Otros sistemas operativos no se han visto afectados. La vulnerabilidad afecta a Firefox en versiones anteriores a la 54, Firefox ESR en versiones anteriores a la 52.2 y Thunderbird en versiones anteriores a la 52.2."
    }
  ],
  "lastModified": "2026-06-17T01:25:08.903",
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