CVE-2018-4218

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
8.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Exploit-DB (verified), epss top5pct, public exploit)
CISA-KEV: Not listedEPSS PROB: 9.0%CVSS: 8.8Exploit: Exploit-DB (verified) · epss top5pct · public exploitExposed services: Not assessed

A fix is available — apply it.

An issue was discovered in certain Apple products. iOS before 11.4 is affected. Safari before 11.1.1 is affected. iCloud before 7.5 on Windows is affected. iTunes before 12.7.5 on Windows is affected. tvOS before 11.4 is affected. watchOS before 4.3.1 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site that triggers an @generatorState use-after-free.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
70
EG Risk 70/100CISA SSVC

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
Severity88% × 45%
Exploitation65% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
9.0%
EPSS %ILE
95th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

June 8, 2018

Last Modified

November 21, 2024

Advisory Details (9)

Auto-updated Aug 20, 2026
Patch available.
generic

About the security content of Safari 11.1.1 - Apple Support

https://support.apple.com/HT208854
generic

About the security content of iCloud for Windows 7.5 - Apple Support

https://support.apple.com/HT208853
generic

About the security content of iTunes 12.7.5 for Windows - Apple Support

https://support.apple.com/HT208852
generic

About the security content of watchOS 4.3.1 - Apple Support

https://support.apple.com/HT208851
generic

About the security content of tvOS 11.4 - Apple Support

https://support.apple.com/HT208850
generic

About the security content of iOS 11.4 - Apple Support

https://support.apple.com/HT208848
generic

WebkitGTK+: Multiple vulnerabilities (GLSA 201808-04) — Gentoo security

https://security.gentoo.org/glsa/201808-04
generic
https://bugs.chromium.org/p/project-zero/issues/detail?id=1553
generic
http://www.securitytracker.com/id/1041029

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibwebkit2gtk-4.0-doc (2.20.3-0ubuntu0.16.04.1) @ xenial2026-05-28ubuntu

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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.20.3-1: fixed in 2.20.3-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.20.3-1: fixed in 2.20.3-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.20.3-1: fixed in 2.20.3-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.20.3-1: fixed in 2.20.3-1
—

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 7× in last 7d / 26× 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 159 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Public exploit code is referenced for this CVE (1 Exploit-DB entry). Defenders should treat patch urgency accordingly.

  • Exploit-DBEDB-44861✓ verified
    Published Jun 8, 2018

    WebKit - Use-After-Free when Resuming Generator

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-4218?
CVE-2018-4218 is a high vulnerability published on June 8, 2018. An issue was discovered in certain Apple products. iOS before 11.4 is affected. Safari before 11.1.1 is affected. iCloud before 7.5 on Windows is affected. iTunes before 12.7.5 on Windows is affected. tvOS before 11.4 is affected. watchOS before 4.3.1 is affected. The issue involves the "WebKit"…
When was CVE-2018-4218 disclosed?
CVE-2018-4218 was first published on June 8, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-4218 actively exploited?
CVE-2018-4218 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 9.0% probability of exploitation in the next 30 days (95th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-4218?
CVE-2018-4218 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2018-4218?
A fix for CVE-2018-4218 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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