CVE-2021-38003

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: 39%CVSS: 8.8Exploit: cisa kev · ssvc active · epss top5pct · public exploitExposed: 0

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

Inappropriate implementation in V8 in Google Chrome prior to 95.0.4638.69 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
39%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

November 23, 2021

Last Modified

October 24, 2025

Advisory Details (5)

Auto-updated Jun 2, 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-2021-38003
generic

[SECURITY] [DSA 5046-1] chromium security update

https://www.debian.org/security/2022/dsa-5046
generic

[SECURITY] Fedora 34 Update: chromium-96.0.4664.110-3.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3W46HRT2UVHWSLZB6JZHQF6JNQWKV744/
generic
https://crbug.com/1263462
generic🔴 Active Exploitation

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2021/10/stable-channel-update-for-desktop_28.html

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
chromium90.0.4430.212-1, 93.0.4577.82-197.0.4692.71-0.1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
chromium—97.0.4692.71-0.1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
chromium—97.0.4692.71-0.1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
chromium—97.0.4692.71-0.1—

Weakness Classification(2)

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 91× in last 7d / 374× 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 1,226 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCSpiralBL0CK/Chrome-V8-RCE-CVE-2021-38003
    First seen Jan 7, 2023

    CVE-2021-38003 exploits extracted from https://twitter.com/WhichbufferArda/status/1609604183535284224

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2021-38003?
CVE-2021-38003 is a critical vulnerability published on November 23, 2021. Inappropriate implementation in V8 in Google Chrome prior to 95.0.4638.69 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
When was CVE-2021-38003 disclosed?
CVE-2021-38003 was first published in the National Vulnerability Database on November 23, 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-2021-38003 actively exploited?
Yes. CISA added CVE-2021-38003 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-2021-38003?
CVE-2021-38003 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-2021-38003?
CVE-2021-38003 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-2021-38003?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-38003, 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-2021-38003

Explore →

Is Your Infrastructure Affected by CVE-2021-38003?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs