CVE-2018-4089

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: 7%CVSS: 8.8Exploit: Exploit-DB (verified) · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

An issue was discovered in certain Apple products. iOS before 11.2.5 is affected. macOS before 10.13.3 is affected. Safari before 11.0.3 is affected. tvOS before 11.2.5 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
8.8(medium)
EG Risk
70(Track)
EG Risk 70/100SSVC: 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
Severity88% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
7%
EPSS %ILE
93%
KEV
Not listed

Published

April 3, 2018

Last Modified

November 21, 2024

Advisory Details (9)

Auto-updated Aug 17, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

SecurityFocus

http://www.securityfocus.com/bid/102778
generic🟡 PoC Available

WebKit - 'detachWrapper' Use-After-Free - Multiple dos Exploit

https://www.exploit-db.com/exploits/43937/
generic

About the security content of Safari 11.0.3 - Apple Support

https://support.apple.com/HT208475
generic

About the security content of macOS High Sierra 10.13.3, Security Update 2018-001 Sierra, and Security Update 2018-001 El Capitan - Apple Support

https://support.apple.com/HT208465
generic

About the security content of iOS 11.2.5 - Apple Support

https://support.apple.com/HT208463
generic

About the security content of tvOS 11.2.5 - Apple Support

https://support.apple.com/HT208462
generic
http://www.securitytracker.com/id/1040267
generic
http://www.securitytracker.com/id/1040266
generic
http://www.securitytracker.com/id/1040265

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.18.6-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.18.6-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.18.6-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.18.6-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 22× 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 134 total refreshes for this CVE.

  1. 2026-09-06 13:44 UTCEPSS rescore
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  74. 2026-06-15 17:45 UTCEPSS rescore
  75. 2026-06-14 23:15 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-43937✓ verified
    First seen Feb 1, 2018

    WebKit - 'detachWrapper' Use-After-Free

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2018-4089?
CVE-2018-4089 is a high vulnerability published on April 3, 2018. An issue was discovered in certain Apple products. iOS before 11.2.5 is affected. macOS before 10.13.3 is affected. Safari before 11.0.3 is affected. tvOS before 11.2.5 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of…
When was CVE-2018-4089 disclosed?
CVE-2018-4089 was first published in the National Vulnerability Database on April 3, 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-2018-4089 actively exploited?
CVE-2018-4089 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7% probability of exploitation in the next 30 days, which ranks it in the top 6.7% of all scored CVEs.
What is the CVSS score of CVE-2018-4089?
CVE-2018-4089 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2018-4089?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-4089, 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

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