CVE-2021-30563

HIGHNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 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 8.8 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
8.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 9%CVSS: 8.8Exploit: NoneExposed: 0

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

Type Confusion in V8 in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

CVSS v3
8.8
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
94.7%
KEV
⚠ Exploited

Published

August 3, 2021

Last Modified

October 24, 2025

Advisory Details (3)

Auto-updated Jun 1, 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-2021-30563
generic
https://crbug.com/1228407
generic🔴 Active Exploitation

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2021/07/stable-channel-update-for-desktop.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 109× in last 7d / 446× 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 779 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2021-30563?
CVE-2021-30563 is a high vulnerability published on August 3, 2021. Type Confusion in V8 in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
When was CVE-2021-30563 disclosed?
CVE-2021-30563 was first published in the National Vulnerability Database on August 3, 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-2021-30563 actively exploited?
Yes. CISA added CVE-2021-30563 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Google Chromium V8. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-30563?
CVE-2021-30563 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-30563?
CVE-2021-30563 affects Google Chromium V8. 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-2021-30563?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30563, 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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