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CVE-2018-6345

Estado: ModificadaCrítica (9.8)—

The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. This affects all supported versions of HHVM (3.30.1 and 3.27.5 and below).

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 (1)

Facebook — Hhvm

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2018-6345",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
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    "cvssMetricV31": [
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          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve-assign@fb.com",
      "affectedData": [
        {
          "vendor": "Facebook",
          "product": "HHVM",
          "versions": [
            {
              "status": "affected",
              "version": "3.30.2"
            },
            {
              "status": "affected",
              "version": "3.30.0",
              "lessThan": "unspecified",
              "versionType": "custom"
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              "status": "affected",
              "version": "3.27.6"
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  "published": "2019-01-15T22:29:00.250",
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      "url": "https://github.com/facebook/hhvm/commit/190ffdf6c8b1ec443be202c7d69e63a7e3da25e3",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
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    },
    {
      "url": "https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.html",
      "tags": [
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        "Vendor Advisory"
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    },
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      "tags": [
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        "Third Party Advisory"
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      "tags": [
        "Release Notes",
        "Vendor Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cve-assign@fb.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-122"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. This affects all supported versions of HHVM (3.30.1 and 3.27.5 and below)."
    },
    {
      "lang": "es",
      "value": "La función number_format es vulnerable a un problema de desbordamiento de memoria dinámica (heap) cuando su segundo argumento ($dec_points) es excesivamente largo. La implementación interna de la función provocará que se cree una cadena con una longitud inválida, que puede interactuar pobremente con otras funciones. Esto afecta a todas las versiones soportadas de HVVM (en versiones anteriores a las 3.30.1 y 3.27.5)."
    }
  ],
  "lastModified": "2026-06-17T02:01:42.760",
  "configurations": [
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              "versionEndIncluding": "3.27.5"
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          "operator": "OR"
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  "sourceIdentifier": "cve-assign@fb.com"
}