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CVE-2019-9816

Estado: ModificadaMedia (5.9)—💥 Exploit

Se presenta una posible vulnerabilidad donde puede producirse una confusión de tipo al manipular objetos de JavaScript en grupos de objetos, lo que permite omitir las comprobaciones de seguridad dentro de estos grupos. *Nota: esta vulnerabilidad solo ha sido demostrado con UnboxedObjects, que está deshabilitada por defecto en todas las versiones compatibles.*. Esta vulnerabilidad afecta a Thunderbird anterior a versión 60.7, Firefox anterior a versión 67 y Firefox ESR anterior a versión 60.7.

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).

💥 Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

Tecnologías afectadas (3)

Mozilla — FirefoxMozilla — Firefox ESRMozilla — Thunderbird

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2019-9816",
  "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": false
      }
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        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      }
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  "affected": [
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      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Thunderbird",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
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              "versionType": "custom"
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          "vendor": "Mozilla",
          "product": "Firefox",
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              "status": "affected",
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          "vendor": "Mozilla",
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  ],
  "published": "2019-07-23T14:15:17.107",
  "references": [
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      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1536768",
      "tags": [
        "Permissions Required"
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      "source": "security@mozilla.org"
    },
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      "url": "https://www.mozilla.org/security/advisories/mfsa2019-13/",
      "tags": [
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      "source": "security@mozilla.org"
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      "url": "https://www.mozilla.org/security/advisories/mfsa2019-15/",
      "tags": [
        "Vendor Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-843"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A possible vulnerability exists where type confusion can occur when manipulating JavaScript objects in object groups, allowing for the bypassing of security checks within these groups. *Note: this vulnerability has only been demonstrated with UnboxedObjects, which are disabled by default on all supported releases.*. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7."
    },
    {
      "lang": "es",
      "value": "Se presenta una posible vulnerabilidad donde puede producirse una confusión de tipo al manipular objetos de JavaScript en grupos de objetos, lo que permite omitir las comprobaciones de seguridad dentro de estos grupos. *Nota: esta vulnerabilidad solo ha sido demostrado con UnboxedObjects, que está deshabilitada por defecto en todas las versiones compatibles.*. Esta vulnerabilidad afecta a Thunderbird anterior a versión 60.7, Firefox anterior a versión 67 y Firefox ESR anterior a versión 60.7."
    }
  ],
  "lastModified": "2026-06-17T02:44:39.550",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "83DEE955-3E09-489F-BE40-2FD33EACF436",
              "versionEndExcluding": "67.0"
            },
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  "sourceIdentifier": "security@mozilla.org"
}