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CVE-2017-2521

Status: ModifiedHigh (8.8)—💥 Exploit

An issue was discovered in certain Apple products. iOS before 10.3.2 is affected. Safari before 10.1.1 is affected. tvOS before 10.2.1 is affected. watchOS before 3.2.2 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.

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).

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Affected technologies (4)

Apple — Iphone OSApple — MAC OS XApple — TvosApple — Watchos

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2017-2521",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "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": true
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "product-security@apple.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2017-05-22T05:29:01.380",
  "references": [
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      "url": "http://www.securityfocus.com/bid/98456",
      "tags": [
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        "VDB Entry"
      ],
      "source": "product-security@apple.com"
    },
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    },
    {
      "url": "https://security.gentoo.org/glsa/201706-15",
      "tags": [
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      "source": "product-security@apple.com"
    },
    {
      "url": "https://support.apple.com/HT207798",
      "tags": [
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      "source": "product-security@apple.com"
    },
    {
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      "tags": [
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      "source": "product-security@apple.com"
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    {
      "url": "https://support.apple.com/HT207801",
      "tags": [
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    },
    {
      "url": "https://support.apple.com/HT207804",
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      "source": "product-security@apple.com"
    },
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      "tags": [
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    },
    {
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      "tags": [
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        "VDB Entry"
      ],
      "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": "An issue was discovered in certain Apple products. iOS before 10.3.2 is affected. Safari before 10.1.1 is affected. tvOS before 10.2.1 is affected. watchOS before 3.2.2 is affected. The issue involves the \"WebKit\" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site."
    },
    {
      "lang": "es",
      "value": "Fue encontrado un problema en algunos productos de Apple. iOS anteriores a la versión 10.3.2 se ven afectados. Safari anterior a la versión 10.1.1 se ve afectado. tvOS anterior a la versión la 10.2.1 se ve afectado. watchOS anterior a la versión 3.2.2 se ve afectado. El problema involucra el componente \"WebKit\". Permite a los atacantes remotos ejecutar código arbitrario o causar una denegación de servicio (corrupción de la memoria y bloqueo de la aplicación) por medio de un sitio web creado."
    }
  ],
  "lastModified": "2026-06-17T01:16:22.387",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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              "versionEndExcluding": "10.3.2"
            },
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              "vulnerable": true,
              "matchCriteriaId": "4FBED4E2-D14C-4884-99A4-8DD729D4EE3E",
              "versionEndExcluding": "10.12.5"
            },
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              "vulnerable": true,
              "matchCriteriaId": "5118C36B-1C20-4481-8207-0E4435D60DAA",
              "versionEndExcluding": "10.2.1"
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              "criteria": "cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*",
              "vulnerable": true,
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              "versionEndExcluding": "3.2.2"
            }
          ],
          "operator": "OR"
        }
      ]
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  ],
  "sourceIdentifier": "product-security@apple.com"
}