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CVE-2021-30666

Estado: AnalizadaAlta (8.8)⚠ Explotación activa

Se abordó un problema de desbordamiento del búfer con un manejo de la memoria mejorada . Este problema es corregido en iOS versión 12.5.3. El procesamiento de contenido web diseñado maliciosamente puede conllevar a una ejecución de código arbitrario. Apple presenta conocimiento de un informe que indica que este problema puede haber sido explotado activamente

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).

CISA KEV — explotada activamente

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Buffer overflow en procesamiento de contenido web con UI:R requiere interacción (click). Explotación activa en ransomware confirma ejecución de código remoto.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Restrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or Program

Tecnologías afectadas (1)

Apple — Iphone OS

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-30666",
  "cveTags": [],
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          "role": "CISA Coordinator",
          "options": [
            {
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            },
            {
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            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-01-29T17:25:57.064117Z"
        }
      }
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          "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"
        },
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        "impactScore": 6.4,
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
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        "userInteractionRequired": true
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    "cvssMetricV31": [
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        "type": "Primary",
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  "published": "2021-09-08T15:15:13.553",
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      "url": "https://support.apple.com/en-us/HT212341",
      "tags": [
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        "Vendor Advisory"
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      "source": "product-security@apple.com"
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    },
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      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30666",
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        "US Government Resource"
      ],
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-119"
        }
      ]
    },
    {
      "type": "Secondary",
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      "description": [
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          "value": "CWE-119"
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  "descriptions": [
    {
      "lang": "en",
      "value": "A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 12.5.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.."
    },
    {
      "lang": "es",
      "value": "Se abordó un problema de desbordamiento del búfer con un manejo de la memoria mejorada . Este problema es corregido en iOS versión 12.5.3. El procesamiento de contenido web diseñado maliciosamente puede conllevar a una ejecución de código arbitrario. Apple presenta conocimiento de un informe que indica que este problema puede haber sido explotado activamente"
    }
  ],
  "lastModified": "2026-06-17T03:50:39.380",
  "cisaActionDue": "2021-11-17",
  "cisaExploitAdd": "2021-11-03",
  "configurations": [
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          "negate": false,
          "cpeMatch": [
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            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "product-security@apple.com",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "Apple iOS WebKit Buffer Overflow Vulnerability"
}