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CVE-2021-30533 Google CVE debrief

CVE-2021-30533 is identified in public records as a Google Chromium PopupBlocker security bypass vulnerability. CISA added it to the Known Exploited Vulnerabilities catalog on 2022-06-27, which makes it a high-priority defensive item for organizations that use Chromium-based software. The supplied source record instructs defenders to apply updates per vendor instructions.

Vendor
Google
Product
Chromium PopupBlocker
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-06-27
Original CVE updated
2022-06-27
Advisory published
2022-06-27
Advisory updated
2022-06-27

Who should care

Security and endpoint teams responsible for Google Chromium deployments, browser fleet management, patch orchestration, and exposure tracking for CISA KEV-listed vulnerabilities.

Technical summary

The available record describes CVE-2021-30533 as a security bypass affecting Google Chromium PopupBlocker. The source corpus does not provide exploit mechanics, affected version ranges, or attack preconditions. What is confirmed is that CISA listed it in KEV on 2022-06-27 and set a remediation due date of 2022-07-18, indicating the issue was important enough to require prompt defensive action.

Defensive priority

High. This is a CISA Known Exploited Vulnerability, so it should be treated as urgent for inventory, patching, and verification even though the supplied corpus does not include detailed exploit information.

Recommended defensive actions

  • Apply vendor-provided updates for affected Chromium deployments as soon as possible.
  • Verify which endpoints, managed browsers, or embedded Chromium-based products are exposed to this CVE.
  • Confirm remediation through patch reporting or version validation rather than assuming deployment completed.
  • Track this item against the CISA KEV catalog and your internal exception process until it is fully remediated.

Evidence notes

This debrief is based only on the supplied CISA KEV source item metadata and the official resource links provided. The record names the issue as 'Google Chromium PopupBlocker Security Bypass Vulnerability,' lists CISA KEV dateAdded as 2022-06-27, dueDate as 2022-07-18, and instructs: 'Apply updates per vendor instructions.' No exploit details were added beyond the supplied corpus.

Official resources

Publicly disclosed in the CVE system and listed by CISA in the Known Exploited Vulnerabilities catalog on 2022-06-27.