CVE-2021-30665

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: 4%CVSS: 8.8Exploit: cisa kev · ssvc activeExposed: 0

A fix is available — apply it.

A memory corruption issue was addressed with improved state management. This issue is fixed in watchOS 7.4.1, iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

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
4%
EPSS %ILE
89%
KEV
⚠ Exploited

Published

September 8, 2021

Last Modified

October 23, 2025

Advisory Details (5)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

About the security content of tvOS 14.6 - Apple Support

https://support.apple.com/en-us/HT212532
generic🔴 Active Exploitation

About the security content of iOS 12.5.3 - Apple Support

https://support.apple.com/en-us/HT212341
generic🔴 Active Exploitation

About the security content of watchOS 7.4.1 - Apple Support

https://support.apple.com/en-us/HT212339
generic🔴 Active Exploitation

About the security content of iOS 14.5.1 and iPadOS 14.5.1 - Apple Support

https://support.apple.com/en-us/HT212336
generic🔴 Active Exploitation

About the security content of macOS Big Sur 11.3.1 - Apple Support

https://support.apple.com/en-us/HT212335

Vendor Advisories for CVE-2021-30665(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibwebkit2gtk-4.0-dev (2.32.3-0ubuntu0.21.04.1) @ hirsute2026-07-26ubuntu
redhatwebkitgtk4-0:2.48.3-2.el7_92025-07-07redhat
redhatwebkit2gtk3-0:2.32.3-2.el82021-11-09redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 67× in last 7d / 377× 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 755 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2021-30665?
CVE-2021-30665 is a critical vulnerability published on September 8, 2021. A memory corruption issue was addressed with improved state management. This issue is fixed in watchOS 7.4.1, iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that…
When was CVE-2021-30665 disclosed?
CVE-2021-30665 was first published in the National Vulnerability Database on September 8, 2021, with the most recent update on October 23, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-30665 actively exploited?
Yes. CISA added CVE-2021-30665 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Apple Multiple Products. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-30665?
CVE-2021-30665 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-2021-30665?
CVE-2021-30665 affects Apple Multiple Products. 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-2021-30665?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30665, 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

Explore the affected products and dependency analysis for CVE-2021-30665

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