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CVE-2017-9951

Estado: ModificadaAlta (7.5)—

The try_read_command function in memcached.c in memcached before 1.4.39 allows remote attackers to cause a denial of service (segmentation fault) via a request to add/set a key, which makes a comparison between signed and unsigned int and triggers a heap-based buffer over-read. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-8705.

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)

Memcached — Memcached

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2017-9951",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
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  ],
  "published": "2017-07-17T13:18:30.970",
  "references": [
    {
      "url": "http://www.securityfocus.com/bid/99874",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://github.com/memcached/memcached/wiki/ReleaseNotes1439",
      "tags": [
        "Third Party Advisory"
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      "source": "cve@mitre.org"
    },
    {
      "url": "https://groups.google.com/forum/message/raw?msg=memcached/ubGWrkmrr4E/nrm1SeVJAQAJ",
      "tags": [
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    {
      "url": "https://usn.ubuntu.com/3588-1/",
      "source": "cve@mitre.org"
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    {
      "url": "https://www.debian.org/security/2018/dsa-4218",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://www.twistlock.com/2017/07/13/cve-2017-9951-heap-overflow-memcached-server-1-4-38-twistlock-vulnerability-report/",
      "tags": [
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      "source": "cve@mitre.org"
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    {
      "url": "http://www.securityfocus.com/bid/99874",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "url": "https://github.com/memcached/memcached/wiki/ReleaseNotes1439",
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      "url": "https://www.twistlock.com/2017/07/13/cve-2017-9951-heap-overflow-memcached-server-1-4-38-twistlock-vulnerability-report/",
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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": "NVD-CWE-noinfo"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The try_read_command function in memcached.c in memcached before 1.4.39 allows remote attackers to cause a denial of service (segmentation fault) via a request to add/set a key, which makes a comparison between signed and unsigned int and triggers a heap-based buffer over-read. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-8705."
    },
    {
      "lang": "es",
      "value": "La función try_read_command en el archivo memcached.c en memcached anterior a versión 1.4.39, permite a los atacantes remotos causar una denegación de servicio (fallo de segmentación) por medio de una petición para agregar y configurar una clave, lo que hace una comparación entre un int firmado y sin firmar y activa una lectura excesiva del búfer en la región heap de la memoria. NOTA: esta vulnerabilidad existe debido a una solución incompleta para el CVE-2016-8705."
    }
  ],
  "lastModified": "2026-06-17T01:29:16.383",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:memcached:memcached:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9BBF21B9-EC29-439E-B875-913CC487A8C5",
              "versionEndIncluding": "1.4.38"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}