CVE-2021-30554

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: 7%CVSS: 8.8Exploit: cisa kev · ssvc activeExposed: 0

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

Use after free in WebGL in Google Chrome prior to 91.0.4472.114 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
7%
EPSS %ILE
94%
KEV
⚠ Exploited

Published

July 2, 2021

Last Modified

October 24, 2025

Advisory Details (5)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. 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/1219857
generic🔴 Active Exploitation

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2021/06/stable-channel-update-for-desktop_17.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 103× in last 7d / 429× 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 1,611 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2021-30554?
CVE-2021-30554 is a critical vulnerability published on July 2, 2021. Use after free in WebGL in Google Chrome prior to 91.0.4472.114 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
When was CVE-2021-30554 disclosed?
CVE-2021-30554 was first published in the National Vulnerability Database on July 2, 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-2021-30554 actively exploited?
Yes. CISA added CVE-2021-30554 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Google Chromium WebGL. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-30554?
CVE-2021-30554 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-2021-30554?
CVE-2021-30554 affects Google Chromium WebGL. 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-2021-30554?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30554, 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-2021-30554

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