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CVE-2021-29964

Estado: ModificadaAlta (7.1)—

A locally-installed hostile program could send `WM_COPYDATA` messages that Firefox would process incorrectly, leading to an out-of-bounds read. *This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 78.11, Firefox < 89, and Firefox ESR < 78.11.

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)

Mozilla — FirefoxMozilla — Firefox ESRMozilla — Thunderbird

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-29964",
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
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  "published": "2021-06-24T14:15:10.333",
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          "value": "CWE-125"
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  "descriptions": [
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      "value": "A locally-installed hostile program could send `WM_COPYDATA` messages that Firefox would process incorrectly, leading to an out-of-bounds read. *This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 78.11, Firefox < 89, and Firefox ESR < 78.11."
    },
    {
      "lang": "es",
      "value": "Un programa hostil instalado localmente podría enviar mensajes \"WM_COPYDATA\" que Firefox procesaría incorrectamente, conllevando una lectura fuera de límites. *Este bug sólo afecta a Firefox en Windows. Otros sistemas operativos no están afectados. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 78.11, Firefox versiones anteriores a 89 y Firefox ESR versiones anteriores a 78.11"
    }
  ],
  "lastModified": "2026-06-17T03:48:31.263",
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