CVE-2021-21148

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: 20%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.

Heap buffer overflow in V8 in Google Chrome prior to 88.0.4324.150 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
20%
EPSS %ILE
97%
KEV
⚠ Exploited

Published

February 9, 2021

Last Modified

October 24, 2025

Advisory Details (7)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic
https://crbug.com/1170176
generic🔴 Active Exploitation

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2021/02/stable-channel-update-for-desktop_4.html
generic

Packet Storm

http://packetstormsecurity.com/files/162579/Chrome-Array-Transfer-Bypass.html
generic

[SECURITY] [DSA 4858-1] chromium security update

https://www.debian.org/security/2021/dsa-4858
generic

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

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

[SECURITY] Fedora 33 Update: chromium-88.0.4324.150-1.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AUQSMNV7INLDDSD3RKI5S5EAULX2QC7P/
generic🔴 Active Exploitation

[SECURITY] Fedora 32 Update: chromium-88.0.4324.150-1.fc32 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7ACWYJ74Z3YN2XH4QMUEGNBC3VXX464L/

Affected Packages

(17 across 17 ecosystems)
Alpine:v3.13(1)
PackageVulnerable rangeFixed inDependents
nodejs—14.15.5-r0—
Alpine:v3.14(1)
PackageVulnerable rangeFixed inDependents
nodejs—14.15.5-r0—
Alpine:v3.15(1)
PackageVulnerable rangeFixed inDependents
nodejs—14.15.5-r0—
Alpine:v3.16(1)
PackageVulnerable rangeFixed inDependents
nodejs—14.15.5-r0—
Alpine:v3.17(1)
PackageVulnerable rangeFixed inDependents
nodejs—14.15.5-r0—
Alpine:v3.18(1)
PackageVulnerable rangeFixed inDependents
nodejs—14.15.5-r0—
Alpine:v3.19(1)
PackageVulnerable rangeFixed inDependents
nodejs—14.15.5-r0—
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
nodejs—14.15.5-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
nodejs—14.15.5-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
nodejs—14.15.5-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
nodejs—14.15.5-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
nodejs—14.15.5-r0—
Debian:10(1)
PackageVulnerable rangeFixed inDependents
chromium73.0.3683.75-1 ... 88.0.4324.96-2 (57 versions)88.0.4324.182-1~deb10u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
chromium—88.0.4324.150-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
chromium—88.0.4324.150-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
chromium—88.0.4324.150-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
chromium—88.0.4324.150-1—

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 105× in last 7d / 391× 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 1,160 total refreshes for this CVE.

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

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.

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2021-21148?
CVE-2021-21148 is a critical vulnerability published on February 9, 2021. Heap buffer overflow in V8 in Google Chrome prior to 88.0.4324.150 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
When was CVE-2021-21148 disclosed?
CVE-2021-21148 was first published in the National Vulnerability Database on February 9, 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-2021-21148 actively exploited?
Yes. CISA added CVE-2021-21148 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-2021-21148?
CVE-2021-21148 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-2021-21148?
CVE-2021-21148 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-2021-21148?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-21148, 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-2021-21148

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