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CVE-2021-30533

Estado: AnalizadaMedia (6.5)⚠ Explotación activa

Una aplicación insuficiente de las políticas en PopupBlocker en Google Chrome anterior a versión 91.0.4472.77, permitía a un atacante remoto omitir las restricciones de navegación por medio de un iframe diseñado

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.

CVE afecta Chrome con AV:N/UI:R permitiendo bypass de restricciones mediante iframe malicioso. T1203 por requerir interacción (UI:R). Impactos: T1189 (XSS/redireccionamiento via popup), T1078 (potencial suplantación si conduce a phishing.

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

Application Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (2)

Fedoraproject — FedoraGoogle — Chrome

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-30533",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-30533",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-02-04T15:04:01.829273Z"
        }
      }
    ],
    "cvssMetricV2": [
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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"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
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      }
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  },
  "affected": [
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      "affectedData": [
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          "product": "Chrome",
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              "versionType": "custom"
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  "published": "2021-06-07T20:15:08.730",
  "references": [
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      "url": "https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html",
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    },
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    },
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      "tags": [
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      "source": "chrome-cve-admin@google.com"
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    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30533",
      "tags": [
        "US Government Resource"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ]
    },
    {
      "type": "Secondary",
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      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Insufficient policy enforcement in PopupBlocker in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass navigation restrictions via a crafted iframe."
    },
    {
      "lang": "es",
      "value": "Una aplicación insuficiente de las políticas en PopupBlocker en Google Chrome anterior a versión 91.0.4472.77, permitía a un atacante remoto omitir las restricciones de navegación por medio de un iframe diseñado"
    }
  ],
  "lastModified": "2026-06-17T03:50:24.617",
  "cisaActionDue": "2022-07-18",
  "cisaExploitAdd": "2022-06-27",
  "configurations": [
    {
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        {
          "negate": false,
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  ],
  "sourceIdentifier": "chrome-cve-admin@google.com",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "Google Chromium PopupBlocker Security Bypass Vulnerability"
}