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CVE-2021-30534

Status: ModifiedMedium (6.5)—

Insufficient policy enforcement in iFrameSandbox in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass navigation restrictions via a crafted HTML page.

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).

Affected technologies (2)

Fedoraproject — FedoraGoogle — Chrome

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-30534",
  "cveTags": [],
  "metrics": {
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          "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
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    "cvssMetricV31": [
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        "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"
        },
        "impactScore": 3.6,
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      }
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  "affected": [
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      "affectedData": [
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          "vendor": "Google",
          "product": "Chrome",
          "versions": [
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  "published": "2021-06-07T20:15:08.757",
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      "source": "chrome-cve-admin@google.com"
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      "source": "chrome-cve-admin@google.com"
    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-863"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Insufficient policy enforcement in iFrameSandbox in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass navigation restrictions via a crafted HTML page."
    },
    {
      "lang": "es",
      "value": "Una aplicación insuficiente de políticas en iFrameSandbox en Google Chrome anterior a versión 91.0.4472.77, permitía a un atacante remoto omitir las restricciones de navegación por medio de una página HTML diseñada"
    }
  ],
  "lastModified": "2026-06-17T03:50:24.810",
  "configurations": [
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        {
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  "sourceIdentifier": "chrome-cve-admin@google.com"
}