CVE-2008-4066

Estado: ModificadaMedia (4.3)—
Mozilla Firefox versión 2.0.0.14, y otras versiones anteriores a 2.0.0.17, permiten a los atacantes remotos omitir los mecanismos de protección de cross-site scripting (XSS) y conducir ataques de tipo XSS por medio de caracteres sustitutos bajos con escape de HTML que son ignorados por el analizador HTML, como es demostrado por una secuencia "jav?ascript", también se conoce como "HTML escaped low surrogates bug."
CVSS

Versión: 2.0
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N
Puntuación base: 4.3
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 1.76%
Percentil entre todas las CVEs puntuadas: 78
Fecha de la puntuación: 14/10/2026
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).
Tecnologías afectadas (1)

Mozilla — Firefox
CWE

CWE-79
Referencias

JSON original (NVD)

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{
  "id": "CVE-2008-4066",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ]
  },
  "affected": [
    {
      "source": "secalert@redhat.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2008-09-24T20:37:04.737",
  "references": [
    {
      "url": "http://blogs.technet.com/bluehat/archive/2008/08/14/targeted-fuzzing.aspx",
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    {
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      "url": "http://lists.opensuse.org/opensuse-security-announce/2008-10/msg00005.html",
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    {
      "url": "http://secunia.com/advisories/31984",
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      "url": "http://secunia.com/advisories/32196",
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      "url": "http://www.debian.org/security/2008/dsa-1669",
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    {
      "url": "http://www.mandriva.com/security/advisories?name=MDVSA-2008:205",
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      "url": "http://www.mandriva.com/security/advisories?name=MDVSA-2008:206",
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    {
      "url": "http://www.mozilla.org/security/announce/2008/mfsa2008-43.html",
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    {
      "url": "http://www.redhat.com/support/errata/RHSA-2008-0882.html",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mozilla Firefox 2.0.0.14, and other versions before 2.0.0.17, allows remote attackers to bypass cross-site scripting (XSS) protection mechanisms and conduct XSS attacks via HTML-escaped low surrogate characters that are ignored by the HTML parser, as demonstrated by a \"jav&#56325ascript\" sequence, aka \"HTML escaped low surrogates bug.\""
    },
    {
      "lang": "es",
      "value": "Mozilla Firefox versión 2.0.0.14, y otras versiones anteriores a 2.0.0.17, permiten a los atacantes remotos omitir los mecanismos de protección de cross-site scripting (XSS) y conducir ataques de tipo XSS por medio de caracteres sustitutos bajos con escape de HTML que son ignorados por el analizador HTML, como es demostrado por una secuencia \"jav?ascript\", también se conoce como \"HTML escaped low surrogates bug.\""
    }
  ],
  "lastModified": "2026-06-16T22:57:06.200",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "matchCriteriaId": "38CD049A-5333-4FF7-AD34-6B74E19BADCB"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "0066576D-D66A-4B59-B5C3-471EEBEE8B9A"
            }
          ],
          "operator": "OR"
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  ],
  "sourceIdentifier": "secalert@redhat.com"
}