CVE-2021-30533

MEDIUMNVD 6.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-06-27), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 6.5 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
6.5
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 17%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.5
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
96.7%
KEV
⚠ Exploited

Published

June 7, 2021

Last Modified

October 24, 2025

Advisory Details (5)

Auto-updated Jun 12, 2026
No patch confirmed yet.
generic

Chromium, Google Chrome: Multiple vulnerabilities (GLSA 202107-06) — Gentoo security

https://security.gentoo.org/glsa/202107-06
generic

[SECURITY] Fedora 34 Update: chromium-91.0.4472.114-1.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
generic

[SECURITY] Fedora 33 Update: chromium-91.0.4472.114-2.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
generic
https://crbug.com/1145553
generic

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 68× in last 7d / 385× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 735 total refreshes for this CVE.

  1. 2026-07-24 14:15 UTCEPSS rescore
  2. 2026-07-23 14:16 UTCEPSS rescore
  3. 2026-07-23 02:00 UTCEG score recompute
  4. 2026-07-22 23:47 UTCEG score recompute
  5. 2026-07-22 23:47 UTCVendor advisory
  6. 2026-07-22 23:47 UTCGHSA enrichment
  7. 2026-07-22 22:47 UTCEG score recompute
  8. 2026-07-22 19:49 UTCGHSA enrichment
  9. 2026-07-22 19:40 UTCCISA KEV update
  10. 2026-07-22 15:53 UTCEG score recompute
  11. 2026-07-22 15:53 UTCVendor advisory
  12. 2026-07-22 15:53 UTCGHSA enrichment
  13. 2026-07-22 14:06 UTCEPSS rescore
  14. 2026-07-22 14:06 UTCEPSS rescore
  15. 2026-07-22 11:54 UTCVendor advisory
  16. 2026-07-22 11:54 UTCGHSA enrichment
  17. 2026-07-22 07:59 UTCVendor advisory
  18. 2026-07-22 07:59 UTCGHSA enrichment
  19. 2026-07-22 04:03 UTCVendor advisory
  20. 2026-07-22 04:03 UTCGHSA enrichment
  21. 2026-07-22 00:03 UTCVendor advisory
  22. 2026-07-22 00:03 UTCGHSA enrichment
  23. 2026-07-21 20:00 UTCVendor advisory
  24. 2026-07-21 19:59 UTCGHSA enrichment
  25. 2026-07-21 16:01 UTCEG score recompute
Show 75 more
  1. 2026-07-21 16:01 UTCVendor advisory
  2. 2026-07-21 16:01 UTCGHSA enrichment
  3. 2026-07-21 15:22 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
  5. 2026-07-21 14:37 UTCCISA KEV update
  6. 2026-07-21 12:04 UTCVendor advisory
  7. 2026-07-21 12:03 UTCGHSA enrichment
  8. 2026-07-21 08:06 UTCVendor advisory
  9. 2026-07-21 08:05 UTCGHSA enrichment
  10. 2026-07-21 04:09 UTCVendor advisory
  11. 2026-07-21 04:09 UTCGHSA enrichment
  12. 2026-07-21 00:12 UTCVendor advisory
  13. 2026-07-21 00:12 UTCGHSA enrichment
  14. 2026-07-20 20:17 UTCEG score recompute
  15. 2026-07-20 20:17 UTCVendor advisory
  16. 2026-07-20 20:17 UTCGHSA enrichment
  17. 2026-07-20 17:05 UTCEPSS rescore
  18. 2026-07-20 16:20 UTCGHSA enrichment
  19. 2026-07-20 12:24 UTCGHSA enrichment
  20. 2026-07-20 08:28 UTCVendor advisory
  21. 2026-07-20 08:28 UTCGHSA enrichment
  22. 2026-07-20 04:32 UTCVendor advisory
  23. 2026-07-20 04:32 UTCGHSA enrichment
  24. 2026-07-20 00:35 UTCVendor advisory
  25. 2026-07-20 00:35 UTCGHSA enrichment
  26. 2026-07-19 20:38 UTCVendor advisory
  27. 2026-07-19 20:38 UTCGHSA enrichment
  28. 2026-07-19 16:42 UTCVendor advisory
  29. 2026-07-19 16:42 UTCGHSA enrichment
  30. 2026-07-19 12:47 UTCVendor advisory
  31. 2026-07-19 12:47 UTCGHSA enrichment
  32. 2026-07-19 08:52 UTCVendor advisory
  33. 2026-07-19 08:52 UTCGHSA enrichment
  34. 2026-07-19 04:56 UTCEG score recompute
  35. 2026-07-19 04:56 UTCVendor advisory
  36. 2026-07-19 04:56 UTCGHSA enrichment
  37. 2026-07-19 02:27 UTCEPSS rescore
  38. 2026-07-19 02:27 UTCEPSS rescore
  39. 2026-07-19 01:00 UTCGHSA enrichment
  40. 2026-07-18 21:05 UTCVendor advisory
  41. 2026-07-18 21:05 UTCGHSA enrichment
  42. 2026-07-18 17:09 UTCVendor advisory
  43. 2026-07-18 17:09 UTCGHSA enrichment
  44. 2026-07-18 13:14 UTCEG score recompute
  45. 2026-07-18 13:14 UTCVendor advisory
  46. 2026-07-18 13:14 UTCGHSA enrichment
  47. 2026-07-18 10:02 UTCEPSS rescore
  48. 2026-07-18 10:02 UTCEPSS rescore
  49. 2026-07-18 09:18 UTCVendor advisory
  50. 2026-07-18 09:18 UTCGHSA enrichment
  51. 2026-07-18 05:22 UTCVendor advisory
  52. 2026-07-18 05:22 UTCGHSA enrichment
  53. 2026-07-18 01:27 UTCVendor advisory
  54. 2026-07-18 01:27 UTCGHSA enrichment
  55. 2026-07-17 21:32 UTCVendor advisory
  56. 2026-07-17 21:32 UTCGHSA enrichment
  57. 2026-07-17 17:36 UTCVendor advisory
  58. 2026-07-17 17:36 UTCGHSA enrichment
  59. 2026-07-17 13:41 UTCVendor advisory
  60. 2026-07-17 13:41 UTCGHSA enrichment
  61. 2026-07-17 09:46 UTCEG score recompute
  62. 2026-07-17 09:46 UTCVendor advisory
  63. 2026-07-17 09:46 UTCGHSA enrichment
  64. 2026-07-17 05:50 UTCVendor advisory
  65. 2026-07-17 05:50 UTCGHSA enrichment
  66. 2026-07-17 01:55 UTCVendor advisory
  67. 2026-07-17 01:55 UTCGHSA enrichment
  68. 2026-07-16 21:58 UTCVendor advisory
  69. 2026-07-16 21:58 UTCGHSA enrichment
  70. 2026-07-16 18:02 UTCGHSA enrichment
  71. 2026-07-16 17:04 UTCCISA KEV update
  72. 2026-07-16 17:00 UTCEPSS rescore
  73. 2026-07-16 14:07 UTCVendor advisory
  74. 2026-07-16 14:07 UTCGHSA enrichment
  75. 2026-07-16 10:12 UTCVendor advisory

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2021-30533?
CVE-2021-30533 is a medium vulnerability published on June 7, 2021. 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.
When was CVE-2021-30533 disclosed?
CVE-2021-30533 was first published in the National Vulnerability Database on June 7, 2021, with the most recent update on October 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-30533 actively exploited?
Yes. CISA added CVE-2021-30533 to the Known Exploited Vulnerabilities catalog on June 27, 2022, affecting Google Chromium PopupBlocker. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-30533?
CVE-2021-30533 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-30533?
CVE-2021-30533 affects Google Chromium PopupBlocker. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2021-30533?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30533, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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