CVE-2018-4233

HIGHNVD 8.88.9▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.9 because EPSS predicts 54% probability of exploitation within the next 30 days (top 1.1% of all CVEs). NVD baseline CVSS 8.8 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Weaponized
8.9EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 53%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), ssvc poc, epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 53%CVSS: 8.8Exploit: Metasploit · Exploit-DB (verified) · ssvc poc · epss top5pct · epss high · public exploitExposed: 0

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.

CVSS v3
8.8
EG Score
8.9(high)
EG Risk
66(Track*)
EG Risk 66/100SSVC: Track*

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
Severity89% × 45%
Exploitation65% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
53%
EPSS %ILE
99%
KEV
Not listed

Published

June 8, 2018

Last Modified

November 21, 2024

Advisory Details (9)

Auto-updated Aug 13, 2026
No patch confirmed yet.
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
http://www.securitytracker.com/id/1041029
generic

Packet Storm Security

http://packetstormsecurity.com/files/153148/Safari-Webkit-Proxy-Object-Type-Confusion.html

Patch Availability(1)

Vendor / EcosystemFixed in / 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 rangeFixed inDependents
webkit2gtk—2.20.3-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.20.3-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.20.3-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
webkit2gtk—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 3× in last 7d / 19× 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.

  1. 2026-09-06 13:44 UTCEPSS rescore
  2. 2026-09-04 13:56 UTCEPSS rescore
  3. 2026-09-02 14:07 UTCEPSS rescore
  4. 2026-08-30 19:13 UTCEPSS rescore
  5. 2026-08-30 01:18 UTCEPSS rescore
  6. 2026-08-28 21:36 UTCEPSS rescore
  7. 2026-08-26 14:42 UTCEPSS rescore
  8. 2026-08-25 13:45 UTCEPSS rescore
  9. 2026-08-24 14:11 UTCEPSS rescore
  10. 2026-08-22 16:07 UTCOSV refresh
  11. 2026-08-21 23:45 UTCEPSS rescore
  12. 2026-08-20 22:51 UTCEPSS rescore
  13. 2026-08-19 17:00 UTCEPSS rescore
  14. 2026-08-18 13:44 UTCEPSS rescore
  15. 2026-08-17 13:43 UTCEPSS rescore
  16. 2026-08-16 02:10 UTCEPSS rescore
  17. 2026-08-15 01:26 UTCEPSS rescore
  18. 2026-08-13 21:56 UTCEPSS rescore
  19. 2026-08-12 13:47 UTCEPSS rescore
  20. 2026-08-07 16:23 UTCEPSS rescore
  21. 2026-08-06 20:05 UTCOSV refresh
  22. 2026-08-06 13:42 UTCEPSS rescore
  23. 2026-07-30 16:24 UTCEPSS rescore
  24. 2026-07-30 01:27 UTCEPSS rescore
  25. 2026-07-28 15:32 UTCEPSS rescore
Show 70 more
  1. 2026-07-27 14:05 UTCEPSS rescore
  2. 2026-07-26 14:51 UTCEPSS rescore
  3. 2026-07-25 14:14 UTCEPSS rescore
  4. 2026-07-25 14:14 UTCEPSS rescore
  5. 2026-07-24 14:14 UTCEPSS rescore
  6. 2026-07-24 14:14 UTCEPSS rescore
  7. 2026-07-23 14:15 UTCEPSS rescore
  8. 2026-07-23 14:15 UTCEPSS rescore
  9. 2026-07-23 01:36 UTCEG score recompute▲ 0.10
  10. 2026-07-22 22:16 UTCEG score recompute▼ 0.20
  11. 2026-07-22 14:05 UTCEPSS rescore
  12. 2026-07-21 15:22 UTCEPSS rescore
  13. 2026-07-21 11:47 UTCOSV refresh
  14. 2026-07-20 17:04 UTCEPSS rescore
  15. 2026-07-20 17:04 UTCEPSS rescore
  16. 2026-07-19 02:26 UTCEPSS rescore
  17. 2026-07-19 02:26 UTCEPSS rescore
  18. 2026-07-16 16:59 UTCEPSS rescore
  19. 2026-07-16 16:59 UTCEPSS rescore
  20. 2026-07-15 16:55 UTCEPSS rescore
  21. 2026-07-13 06:10 UTCEPSS rescore
  22. 2026-07-12 05:43 UTCEPSS rescore
  23. 2026-07-09 19:06 UTCEPSS rescore
  24. 2026-07-05 02:27 UTCEPSS rescore
  25. 2026-07-04 06:56 UTCOSV refresh
  26. 2026-07-01 15:03 UTCEPSS rescore
  27. 2026-07-01 15:03 UTCEPSS rescore
  28. 2026-06-30 23:20 UTCEPSS rescore
  29. 2026-06-30 23:20 UTCEPSS rescore
  30. 2026-06-28 04:53 UTCEPSS rescore
  31. 2026-06-28 04:53 UTCEPSS rescore
  32. 2026-06-27 03:06 UTCEPSS rescore
  33. 2026-06-27 03:06 UTCEPSS rescore
  34. 2026-06-25 13:47 UTCEPSS rescore
  35. 2026-06-25 13:47 UTCEPSS rescore
  36. 2026-06-24 14:02 UTCEPSS rescore
  37. 2026-06-24 14:02 UTCEPSS rescore
  38. 2026-06-23 21:30 UTCEPSS rescore
  39. 2026-06-23 21:30 UTCEPSS rescore
  40. 2026-06-21 14:54 UTCEPSS rescore
  41. 2026-06-21 14:54 UTCEPSS rescore
  42. 2026-06-21 01:57 UTCEPSS rescore
  43. 2026-06-21 01:57 UTCEPSS rescore
  44. 2026-06-19 19:23 UTCEPSS rescore
  45. 2026-06-19 19:23 UTCEPSS rescore
  46. 2026-06-17 17:50 UTCEPSS rescore
  47. 2026-06-16 17:50 UTCEPSS rescore
  48. 2026-06-16 17:50 UTCEPSS rescore
  49. 2026-06-15 18:39 UTCOSV refresh
  50. 2026-06-15 17:45 UTCEPSS rescore
  51. 2026-06-12 23:09 UTCEPSS rescore
  52. 2026-06-12 23:09 UTCEPSS rescore
  53. 2026-06-10 22:16 UTCEPSS rescore
  54. 2026-06-10 13:19 UTCEPSS rescore
  55. 2026-06-08 14:14 UTCEPSS rescore
  56. 2026-06-06 13:45 UTCEPSS rescore
  57. 2026-06-06 13:45 UTCEPSS rescore
  58. 2026-06-05 06:08 UTCEPSS rescore
  59. 2026-06-05 06:08 UTCEPSS rescore
  60. 2026-06-04 13:10 UTCEPSS rescore
  61. 2026-06-04 13:10 UTCEPSS rescore
  62. 2026-06-02 20:11 UTCEPSS rescore
  63. 2026-05-31 00:14 UTCEPSS rescore
  64. 2026-05-31 00:14 UTCEPSS rescore
  65. 2026-05-28 13:43 UTCEPSS rescore
  66. 2026-05-28 13:42 UTCEPSS rescore
  67. 2026-05-28 07:03 UTCEG score recompute
  68. 2026-05-28 07:03 UTCVendor advisory
  69. 2026-05-28 07:03 UTCGHSA enrichment
  70. 2026-05-26 00:46 UTCOSV refresh

Publicly available exploits

(4 references)

Working exploit code is in the public domain (2 Metasploit modules) (1 GitHub PoC) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-45998✓ verified
    First seen Dec 14, 2018

    Safari - Proxy Object Type Confusion (Metasploit)

    Open source ↗
  • GitHub PoCsaelo/cve-2018-4233
    First seen Aug 8, 2018

    Exploit for CVE-2018-4233, a WebKit JIT optimization bug used during Pwn2Own 2018

    Open source ↗
  • Metasploitexploit/apple_ios/browser/webkit_createthis✓ verified
    First seen Mar 15, 2018

    Safari Webkit Proxy Object Type Confusion

    Open source ↗
  • Metasploitexploit/osx/browser/safari_proxy_object_type_confusion✓ verified
    First seen Mar 15, 2018

    Safari Proxy Object Type Confusion

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-4233?
CVE-2018-4233 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-2018-4233 disclosed?
CVE-2018-4233 was first published in the National Vulnerability Database 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-2018-4233 actively exploited?
CVE-2018-4233 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 53% probability of exploitation in the next 30 days, which ranks it in the top 1.1% of all scored CVEs.
What is the CVSS score of CVE-2018-4233?
CVE-2018-4233 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.9.
How do I remediate CVE-2018-4233?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-4233, 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-2018-4233

Explore →

Is Your Infrastructure Affected by CVE-2018-4233?

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

Start Free Scan →Browse All CVEs