Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-30533

CVE-2021-30533MEDIUM

Google Chromium PopupBlocker

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  N  H  N    6.5   .1674   97.0   YES

AFFECTED
  Product  Versions       Fixed
  Chrome   unspecified –  —

TIMELINE
  Apr 13  Reserved by Chrome
  Jun 7   Published (CNA: Chrome)
  Jun 27  Added to CISA KEV, remediation due 2022-07-18

CWE-863 · CNA: Chrome · CVSS v3.1 · 6 references · KEV due July 18, 2022

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 13, 2021	Reserved	Reserved by Chrome
June 7, 2021	Published	Published (CNA: Chrome)
June 27, 2022	KEV ADDED	Added to CISA KEV, remediation due 2022-07-18

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Google	Chrome	—	unspecified	—

Weaknesses

CWE-863

References (6)

https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html [x_refsource_MISC]
https://crbug.com/1145553 [x_refsource_MISC]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/ [vendor-advisory, x_refsource_FEDORA]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/ [vendor-advisory, x_refsource_FEDORA]
https://security.gentoo.org/glsa/202107-06 [vendor-advisory, x_refsource_GENTOO]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30533 [government-resource]

Authoritative record: CVE-2021-30533 at cve.org

Vendors: google

Weaknesses: CWE-863

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-30533 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.