CVE-2021-1870

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 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 9.8 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
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 8%CVSS: 9.8Exploit: cisa kev · ssvc activeExposed: 0

A fix is available — apply it.

A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

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
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
8%
EPSS %ILE
94%
KEV
⚠ Exploited

Published

April 2, 2021

Last Modified

October 23, 2025

Advisory Details (5)

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

About the security content of macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave - Apple Support

https://support.apple.com/en-us/HT212147
generic🔴 Active Exploitation

About the security content of iOS 14.4 and iPadOS 14.4 - Apple Support

https://support.apple.com/en-us/HT212146
generic

WebkitGTK+: Multiple vulnerabilities (GLSA 202104-03) — Gentoo security

https://security.gentoo.org/glsa/202104-03
generic

[SECURITY] Fedora 33 Update: webkit2gtk3-2.32.0-1.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
generic

[SECURITY] Fedora 32 Update: webkit2gtk3-2.30.6-1.fc32 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/

Vendor Advisories for CVE-2021-1870(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
ubuntuwebkit2gtk-driver (2.30.6-0ubuntu0.20.04.1) @ focal2026-07-26ubuntu
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.

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 61× in last 7d / 362× 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 738 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2021-1870?
CVE-2021-1870 is a critical vulnerability published on April 2, 2021. A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this…
When was CVE-2021-1870 disclosed?
CVE-2021-1870 was first published in the National Vulnerability Database on April 2, 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-2021-1870 actively exploited?
Yes. CISA added CVE-2021-1870 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Apple iOS, iPadOS, and macOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-1870?
CVE-2021-1870 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2021-1870?
CVE-2021-1870 affects Apple iOS, iPadOS, and macOS. 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-2021-1870?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-1870, 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-2021-1870

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