CVE-2018-4443

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-14. 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), public exploit)
CISA-KEV: Not listedEPSS PROB: 5.8%CVSS: 8.8Exploit: Exploit-DB (verified) · public exploitExposed services: Not assessed

A fix is available — apply it.

A memory corruption issue was addressed with improved memory handling. This issue affected versions prior to iOS 12.1.1, tvOS 12.1.1, watchOS 5.1.2, Safari 12.0.2, iTunes 12.9.2 for Windows, iCloud for Windows 7.9.

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
5.8%
EPSS %ILE
92nd
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

April 3, 2019

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Aug 2, 2026
Patch available.
generic

About the security content of Safari 12.0.2 - Apple Support

https://support.apple.com/kb/HT209344
generic

About the security content of watchOS 5.1.2 - Apple Support

https://support.apple.com/kb/HT209343
generic

About the security content of tvOS 12.1.1 - Apple Support

https://support.apple.com/kb/HT209342
generic

About the security content of iOS 12.1.1 - Apple Support

https://support.apple.com/kb/HT209340
generic

About the security content of iCloud for Windows 7.9 - Apple Support

https://support.apple.com/kb/HT209346
generic

About the security content of iTunes 12.9.2 for Windows - Apple Support

https://support.apple.com/kb/HT209345

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.22.3-1: fixed in 2.22.3-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.22.3-1: fixed in 2.22.3-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.22.3-1: fixed in 2.22.3-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.22.3-1: fixed in 2.22.3-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 24× 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. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-03 14:21 UTCEPSS rescore
  3. 2026-10-01 19:44 UTCEPSS rescore
  4. 2026-09-30 14:59 UTCEPSS rescore
  5. 2026-09-30 10:02 UTCEG score recompute
  6. 2026-09-29 15:12 UTCEPSS rescore
  7. 2026-09-28 13:46 UTCEPSS rescore
  8. 2026-09-28 10:32 UTCOSV refresh
  9. 2026-09-27 13:40 UTCEPSS rescore
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  23. 2026-09-08 14:34 UTCOSV refresh
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  1. 2026-09-04 05:02 UTCEPSS rescore
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  11. 2026-08-22 00:41 UTCOSV refresh
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  26. 2026-08-06 05:24 UTCOSV refresh
  27. 2026-08-04 15:05 UTCEPSS rescore
  28. 2026-08-04 10:33 UTCEPSS rescore
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  42. 2026-07-23 01:36 UTCEG score recompute
  43. 2026-07-22 22:16 UTCEG score recompute
  44. 2026-07-22 14:05 UTCEPSS rescore
  45. 2026-07-21 15:22 UTCEPSS rescore
  46. 2026-07-20 18:32 UTCOSV refresh
  47. 2026-07-20 17:04 UTCEPSS rescore
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  49. 2026-07-19 14:28 UTCEPSS rescore
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  70. 2026-07-03 14:26 UTCOSV refresh
  71. 2026-07-01 15:03 UTCEPSS rescore
  72. 2026-07-01 15:03 UTCEPSS rescore
  73. 2026-06-30 23:20 UTCEPSS rescore
  74. 2026-06-30 23:20 UTCEPSS rescore
  75. 2026-06-28 14:04 UTCEPSS rescore

Publicly available exploits

(1 reference)

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

  • Exploit-DBEDB-46071✓ verified
    First seen Jan 2, 2019

    WebKit JSC - 'AbstractValue::set' Use-After-Free

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2018-4443?
CVE-2018-4443 is a high vulnerability published on April 3, 2019. A memory corruption issue was addressed with improved memory handling. This issue affected versions prior to iOS 12.1.1, tvOS 12.1.1, watchOS 5.1.2, Safari 12.0.2, iTunes 12.9.2 for Windows, iCloud for Windows 7.9.
When was CVE-2018-4443 disclosed?
CVE-2018-4443 was first published on April 3, 2019, 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-2018-4443 actively exploited?
CVE-2018-4443 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 5.8% probability of exploitation in the next 30 days (92nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-4443?
CVE-2018-4443 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2018-4443?
A fix for CVE-2018-4443 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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