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CVE-2019-11720

Estado: ModificadaMedia (6.1)—

Algunos caracteres unicode son tratados incorrectamente como espacios en blanco durante el análisis de contenido web en lugar de desencadenar errores de análisis. Esto permite que sea procesado el código malicioso, evadiendo el filtrado de cross-site scripting (XSS). Esta vulnerabilidad afecta a Firefox anteriores a versión 68.

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 (2)

Mozilla — FirefoxOpensuse — Leap

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2019-11720",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "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,
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          "scope": "CHANGED",
          "version": "3.1",
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
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  "affected": [
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      "source": "security@mozilla.org",
      "affectedData": [
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          "vendor": "Mozilla",
          "product": "Firefox",
          "versions": [
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              "status": "affected",
              "version": "unspecified",
              "lessThan": "68",
              "versionType": "custom"
            }
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  "published": "2019-07-23T14:15:16.140",
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Some unicode characters are incorrectly treated as whitespace during the parsing of web content instead of triggering parsing errors. This allows malicious code to then be processed, evading cross-site scripting (XSS) filtering. This vulnerability affects Firefox < 68."
    },
    {
      "lang": "es",
      "value": "Algunos caracteres unicode son tratados incorrectamente como espacios en blanco durante el análisis de contenido web en lugar de desencadenar errores de análisis. Esto permite que sea procesado el código malicioso, evadiendo el filtrado de cross-site scripting (XSS). Esta vulnerabilidad afecta a Firefox anteriores a versión 68."
    }
  ],
  "lastModified": "2026-06-17T02:13:30.170",
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}