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CVE-2017-7804

Status: ModifiedHigh (7.5)—

The destructor function for the "WindowsDllDetourPatcher" class can be re-purposed by malicious code in concert with another vulnerability to write arbitrary data to an attacker controlled location in memory. This can be used to bypass existing memory protections in this situation. Note: This attack only affects Windows operating systems. Other operating systems are not affected. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Mozilla — FirefoxMozilla — Thunderbird

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2017-7804",
  "cveTags": [],
  "metrics": {
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
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          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
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          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
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  "affected": [
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      "affectedData": [
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          "vendor": "Mozilla",
          "product": "Thunderbird",
          "versions": [
            {
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  "published": "2018-06-11T21:29:09.983",
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      "source": "security@mozilla.org"
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      "source": "nvd@nist.gov",
      "description": [
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          "value": "CWE-20"
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  ],
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    {
      "lang": "en",
      "value": "The destructor function for the \"WindowsDllDetourPatcher\" class can be re-purposed by malicious code in concert with another vulnerability to write arbitrary data to an attacker controlled location in memory. This can be used to bypass existing memory protections in this situation. Note: This attack only affects Windows operating systems. Other operating systems are not affected. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55."
    },
    {
      "lang": "es",
      "value": "La función destructor para la clase \"WindowsDllDetourPatcher\" puede ser reutilizada por un código malicioso junto con otra vulnerabilidad para introducir datos arbitrarios a una ubicación controlada por el atacante en la memoria. Esto se puede utilizar para omitir las protecciones de memoria existentes en esta situación. Nota: Este ataque solo afecta a sistemas operativos Windows. Los otros sistemas operativos no se ven afectados. Esta vulnerabilidad afecta a las versiones anteriores a la 52.3 de Thunderbird, las versiones anteriores a la 52.3 de Firefox ESR y las versiones anteriores a la 55 de Firefox."
    }
  ],
  "lastModified": "2026-06-17T01:25:13.697",
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