CVE-2021-30633

CRITICALNVD 9.69.6—
EchelonGraph scoreHIGH confidence

Score elevated to 9.6 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.6 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
9.6EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 33%CVSS: 9.6Exploit: cisa kev · ssvc active · epss top5pctExposed: 0

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

Use after free in Indexed DB API in Google Chrome prior to 93.0.4577.82 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.

CVSS v3
9.6
EG Score
9.6(high)
EG Risk
83(Attend)
EG Risk 83/100SSVC: 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
Severity96% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
33%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

October 8, 2021

Last Modified

October 24, 2025

Advisory Details (5)

Auto-updated Sep 23, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30633
generic

[SECURITY] Fedora 35 Update: chromium-94.0.4606.61-1.fc35 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PM7MOYYHJSWLIFZ4TPJTD7MSA3HSSLV2/
generic

[SECURITY] Fedora 33 Update: chromium-94.0.4606.61-1.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4DDW7HAHTS3SDVXBQUY4SURELO5D4X7R/
generic
https://crbug.com/1247766
generic🔴 Active Exploitation

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2021/09/stable-channel-update-for-desktop.html

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
chromium90.0.4430.212-193.0.4577.82-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
chromium—93.0.4577.82-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
chromium—93.0.4577.82-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
chromium—93.0.4577.82-1—

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 98× in last 7d / 419× 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 1,586 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2021-30633?
CVE-2021-30633 is a critical vulnerability published on October 8, 2021. Use after free in Indexed DB API in Google Chrome prior to 93.0.4577.82 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.
When was CVE-2021-30633 disclosed?
CVE-2021-30633 was first published in the National Vulnerability Database on October 8, 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-2021-30633 actively exploited?
Yes. CISA added CVE-2021-30633 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Google Chromium Indexed DB API. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-30633?
CVE-2021-30633 has a CVSS v3 base score of 9.6 (NVD).
Which products are affected by CVE-2021-30633?
CVE-2021-30633 affects Google Chromium Indexed DB API. 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-2021-30633?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30633, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-30633

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