{
  "id": "CVE-2021-30533",
  "url": "https://spydr.io/cve/CVE-2021-30533",
  "published": "2021-06-07T20:15:08.730Z",
  "modified": "2026-06-17T03:50:24.617Z",
  "score": 6.5,
  "severity": "medium",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
  "score_source": "NVD",
  "epss": 0.16742,
  "epss_percentile": 0.96964,
  "exploited": true,
  "kev": {
    "added": "2022-06-27",
    "due": "2022-07-18",
    "action": "Apply updates per vendor instructions.",
    "ransomware": "Unknown",
    "name": "Google Chromium PopupBlocker Security Bypass Vulnerability",
    "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-30533"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "Google"
  ],
  "products": [
    "Google Chrome"
  ],
  "cwes": [
    "CWE-863"
  ],
  "description": "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.",
  "status": "Analyzed",
  "score_type": "Primary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 6.5,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://crbug.com/1145553",
      "tags": [
        "Exploit",
        "Issue Tracking",
        "Patch",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/",
      "tags": [
        "Mailing List",
        "Release Notes"
      ]
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/",
      "tags": [
        "Mailing List",
        "Release Notes"
      ]
    },
    {
      "url": "https://security.gentoo.org/glsa/202107-06",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30533",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-30533",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}