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CVE-2018-6340

Estado: ModificadaAlta (8.1)—

The Memcache::getextendedstats function can be used to trigger an out-of-bounds read. Exploiting this issue requires control over memcached server hostnames and/or ports. This affects all supported versions of HHVM (3.30 and 3.27.4 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)

Mostrar
{
  "id": "CVE-2018-6340",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2018-6340",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-05-06T18:59:29.098252Z"
        }
      }
    ],
    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 8.1,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
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          "confidentialityImpact": "HIGH"
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    "cvssMetricV31": [
      {
        "type": "Secondary",
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          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
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          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "exploitabilityScore": 2.2
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  },
  "affected": [
    {
      "source": "cve-assign@fb.com",
      "affectedData": [
        {
          "vendor": "Facebook",
          "product": "HHVM",
          "versions": [
            {
              "status": "affected",
              "version": "3.30.1"
            },
            {
              "status": "affected",
              "version": "3.30.0",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "3.27.5"
            },
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "3.27.5",
              "versionType": "custom"
            }
          ]
        }
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  ],
  "published": "2018-12-31T22:29:00.327",
  "references": [
    {
      "url": "https://github.com/facebook/hhvm/commit/4bff3bfbe90d10451e4638c2118d1ad1117bb3e3",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "cve-assign@fb.com"
    },
    {
      "url": "https://hhvm.com/blog/2018/12/18/hhvm-3.30.1.html",
      "tags": [
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      ],
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    },
    {
      "url": "https://github.com/facebook/hhvm/commit/4bff3bfbe90d10451e4638c2118d1ad1117bb3e3",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://hhvm.com/blog/2018/12/18/hhvm-3.30.1.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cve-assign@fb.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Memcache::getextendedstats function can be used to trigger an out-of-bounds read. Exploiting this issue requires control over memcached server hostnames and/or ports. This affects all supported versions of HHVM (3.30 and 3.27.4 and below)."
    },
    {
      "lang": "es",
      "value": "La función Memcache::getextendedstats puede utilizarse para provocar una lectura fuera de límites. La explotación de este problema requiere control sobre nombres y/o puertos del servidor \"memcatched\". Esto afecta a todas las versiones soportadas de HVVM (en versiones anteriores a las 3.30 y 3.27.4)."
    }
  ],
  "lastModified": "2026-06-17T02:01:41.807",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "matchCriteriaId": "20625917-395C-4FE6-B681-8C8C2078549E",
              "versionEndIncluding": "3.27.4"
            },
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              "vulnerable": true,
              "matchCriteriaId": "902E260E-9611-4217-A38A-4143F6C5A165"
            }
          ],
          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "cve-assign@fb.com"
}