CVE-2021-21206

CRITICALNVD 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 9%CVSS: 8.8Exploit: 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 Blink in Google Chrome prior to 89.0.4389.128 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 PROB
9%
EPSS %ILE
95%
KEV
⚠ Exploited

Published

April 26, 2021

Last Modified

October 24, 2025

Advisory Details (6)

Auto-updated Jun 1, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

[SECURITY] Fedora 33 Update: chromium-90.0.4430.93-1.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U3GZ42MYPGD35V652ZPVPYYS7A7LVXVY/
generic

[SECURITY] Fedora 32 Update: chromium-90.0.4430.93-1.fc32 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EAJ42L4JFPBJATCZ7MOZQTUDGV4OEHHG/
generic
https://crbug.com/1196781
generic🔴 Active Exploitation

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop.html
generic

Chromium, Google Chrome: Multiple vulnerabilities (GLSA 202104-08) — Gentoo security

https://security.gentoo.org/glsa/202104-08
generic

[SECURITY] Fedora 34 Update: chromium-90.0.4430.93-1.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VUZBGKGVZADNA3I24NVG7HAYYUTOSN5A/

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
chromium—90.0.4430.72-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
chromium—90.0.4430.72-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
chromium—90.0.4430.72-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
chromium—90.0.4430.72-1—

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 106× in last 7d / 435× 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 1,632 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2021-21206?
CVE-2021-21206 is a critical vulnerability published on April 26, 2021. Use after free in Blink in Google Chrome prior to 89.0.4389.128 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
When was CVE-2021-21206 disclosed?
CVE-2021-21206 was first published in the National Vulnerability Database on April 26, 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-2021-21206 actively exploited?
Yes. CISA added CVE-2021-21206 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Google Chromium Blink. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-21206?
CVE-2021-21206 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-2021-21206?
CVE-2021-21206 affects Google Chromium Blink. 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-2021-21206?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-21206, 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-2021-21206

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