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CVE-2021-43528

Estado: ModificadaMedia (6.5)—

Thunderbird habilitó inesperadamente JavaScript en el área de composición. El contexto de ejecución de JavaScript se limitaba a esta área y no recibía privilegios a nivel de cromo, pero podía ser usado como un trampolín para avanzar en un ataque con otras vulnerabilidades. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 91.4.0

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)

Debian — Debian LinuxMozilla — Thunderbird

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-43528",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
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          "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"
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        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
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        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
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      "source": "security@mozilla.org",
      "affectedData": [
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          "vendor": "Mozilla",
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          "versions": [
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  "published": "2021-12-08T22:15:09.210",
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-269"
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      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Thunderbird unexpectedly enabled JavaScript in the composition area. The JavaScript execution context was limited to this area and did not receive chrome-level privileges, but could be used as a stepping stone to further an attack with other vulnerabilities. This vulnerability affects Thunderbird < 91.4.0."
    },
    {
      "lang": "es",
      "value": "Thunderbird habilitó inesperadamente JavaScript en el área de composición. El contexto de ejecución de JavaScript se limitaba a esta área y no recibía privilegios a nivel de cromo, pero podía ser usado como un trampolín para avanzar en un ataque con otras vulnerabilidades. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 91.4.0"
    }
  ],
  "lastModified": "2026-06-17T04:11:04.370",
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