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CVE-2017-17821

Estado: ModificadaCrítica (9.8)—

WTF/wtf/FastBitVector.h en WebKit, tal y como viene distribuido en Safari Technology Preview Release 46, permite que los atacantes remotos provoquen una denegación de servicio (desbordamiento de búfer) o posiblemente otro impacto porque llama a la función FastBitVectorWordOwner::resizeSlow (en WTF/wtf/FastBitVector.cpp) para un propósito diferente que inicializar un tamaño bitvector, y resizeSlow gestiona de manera incorrecta los casos en los que la longitud antigua del array es mayor que la nueva.

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)

Apple — Safari

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2017-17821",
  "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
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.0/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@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2017-12-21T03:29:00.630",
  "references": [
    {
      "url": "https://bugs.webkit.org/show_bug.cgi?id=181020",
      "tags": [
        "Permissions Required"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://github.com/dwfault/PoCs/blob/master/WebKit%20Misuse%20of%20WTF:wtf:FastBitVector%20result%20in%20potential%20BOF/WebKit%20Misuse%20of%20WTF:wtf:FastBitVector%20result%20in%20potential%20BOF.md",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://bugs.webkit.org/show_bug.cgi?id=181020",
      "tags": [
        "Permissions Required"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/dwfault/PoCs/blob/master/WebKit%20Misuse%20of%20WTF:wtf:FastBitVector%20result%20in%20potential%20BOF/WebKit%20Misuse%20of%20WTF:wtf:FastBitVector%20result%20in%20potential%20BOF.md",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-119"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "WTF/wtf/FastBitVector.h in WebKit, as distributed in Safari Technology Preview Release 46, allows remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact because it calls the FastBitVectorWordOwner::resizeSlow function (in WTF/wtf/FastBitVector.cpp) for a purpose other than initializing a bitvector size, and resizeSlow mishandles cases where the old array length is greater than the new array length."
    },
    {
      "lang": "es",
      "value": "WTF/wtf/FastBitVector.h en WebKit, tal y como viene distribuido en Safari Technology Preview Release 46, permite que los atacantes remotos provoquen una denegación de servicio (desbordamiento de búfer) o posiblemente otro impacto porque llama a la función FastBitVectorWordOwner::resizeSlow (en WTF/wtf/FastBitVector.cpp) para un propósito diferente que inicializar un tamaño bitvector, y resizeSlow gestiona de manera incorrecta los casos en los que la longitud antigua del array es mayor que la nueva."
    }
  ],
  "lastModified": "2026-06-17T01:11:42.767",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:apple:safari:46:*:*:*:technology_preview:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D0B3F3F3-4D70-47BD-A6D7-24A20B0FFB06"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}