CVE-2021-30533
Google Chromium PopupBlocker Security Bypass Vulnerability
- Medium 6.5
- Exploited: added to CISA KEV 27 Jun 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.
Key facts
- Published
- 7 Jun 2021
- Last changed
- 21 Oct 2025
- Assigned by
- Chrome
- KEV added
- 27 Jun 2022
- KEV fix due
- 18 Jul 2022
- EPSS
- 16.742% likely to be exploited in the next 30 days, higher than 97.083% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: partial
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 6.5CVSS 3.1, Mediumfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Chrome |
|
Timeline
- 7 Jun 2021 Published
- 27 Jun 2022 CVE-2021-30533 added to CISA KEV
- 27 Jun 2022 Added to the CISA KEV catalogue