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CVE-2021-1879

Estado: AnalizadaMedia (6.1)⚠ Explotación activa

Este problema es abordado con una administración del tiempo de vida de objetos mejorada. Este problema es corregido en iOS versión 12.5.2, iOS versión 14.4.2 y iPadOS versión 14.4.2, watchOS versión 7.3.3. El procesamiento de contenido web diseñado malicioso puede conllevar a ataques de tipo cross site scripting universales. Apple tiene conocimiento de un reporte 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.

XSS universal en navegador Safari (AV:N/UI:R) permite ejecución de scripts; CWE-79 confirma inyección, explotación activa reportada.

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 ContentUser TrainingExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or ProgramApplication Isolation and Sandboxing

Tecnologías afectadas (3)

Apple — IpadosApple — Iphone OSApple — Watchos

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-1879",
  "cveTags": [],
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        "ssvcData": {
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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-01-29T17:31:41.503370Z"
        }
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          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
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    "cvssMetricV31": [
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        "cvssData": {
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  ],
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      "tags": [
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      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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    },
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
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          "lang": "en",
          "value": "CWE-79"
        }
      ]
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  ],
  "descriptions": [
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      "lang": "en",
      "value": "This issue was addressed by improved management of object lifetimes. This issue is fixed in iOS 12.5.2, iOS 14.4.2 and iPadOS 14.4.2, watchOS 7.3.3. Processing maliciously crafted web content may lead to universal cross site scripting. Apple is aware of a report that this issue may have been actively exploited.."
    },
    {
      "lang": "es",
      "value": "Este problema es abordado con una administración del tiempo de vida de objetos mejorada. Este problema es corregido en iOS versión 12.5.2, iOS versión 14.4.2 y iPadOS versión 14.4.2, watchOS versión 7.3.3. El procesamiento de contenido web diseñado malicioso puede conllevar a ataques de tipo cross site scripting universales. Apple tiene conocimiento de un reporte que indica que este problema puede haber sido explotado activamente."
    }
  ],
  "lastModified": "2026-06-17T03:32:42.883",
  "cisaActionDue": "2021-11-17",
  "cisaExploitAdd": "2021-11-03",
  "configurations": [
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  "sourceIdentifier": "product-security@apple.com",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability"
}