{"id":"CVE-2021-30533","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-30533","generatedAt":"2026-10-31T15:10:23.953Z","title":"Google Chromium PopupBlocker Security Bypass Vulnerability","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.","published":"2021-06-07T20:15:09.000Z","lastModified":"2026-06-17T03:50:25.000Z","status":"Analyzed","sourceIdentifier":"chrome-cve-admin@google.com","cvss":{"version":"3.1","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},"cwe":["CWE-863"],"affected":["google/chrome","fedoraproject/fedora"],"epss":{"score":0.16742,"percentile":0.97031,"date":"2026-10-30","history":[]},"kev":{"listed":true,"dateAdded":"2022-06-27","dueDate":"2022-07-18","knownRansomwareCampaignUse":"Unknown","notes":"Apply updates per vendor instructions.\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-30533"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 18 July 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[],"references":[{"url":"https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html","tags":["Release Notes","Vendor Advisory"],"source":"chrome-cve-admin@google.com"},{"url":"https://crbug.com/1145553","tags":["Exploit","Issue Tracking","Patch","Vendor Advisory"],"source":"chrome-cve-admin@google.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/","tags":["Mailing List","Release Notes"],"source":"chrome-cve-admin@google.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/","tags":["Mailing List","Release Notes"],"source":"chrome-cve-admin@google.com"},{"url":"https://security.gentoo.org/glsa/202107-06","tags":["Third Party Advisory"],"source":"chrome-cve-admin@google.com"},{"url":"https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://crbug.com/1145553","tags":["Exploit","Issue Tracking","Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/","tags":["Mailing List","Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/","tags":["Mailing List","Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202107-06","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30533","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-30533","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}