What is CVE-2018-4219?

CVE-2018-4219 is a high-severity vulnerability in Apple Mac OS X, classified under Incorrect Type Conversion or Cast. CVSS score: 7.8/10. Published 2018-06-08.

How severe is CVE-2018-4219?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Apple Mac OS X

CVE-2018-4219

An issue was discovered in certain Apple products. macOS before 10.13.5 is affected. The issue involves the "ATS" component. It allows attackers to gain privileges via a crafted app that leverages type confusion.

Published 2018-06-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Apple Mac OS X

Weakness classification (CWE)

CWE-704 — Incorrect Type Conversion or Cast

References

www.securitytracker.com/id/1041027 (VDB Entry, Third Party Advisory, vdb-entry)
support.apple.com/HT208849 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-4219?: CVE-2018-4219 is a high-severity vulnerability in Apple Mac OS X, classified under Incorrect Type Conversion or Cast. CVSS score: 7.8/10. Published 2018-06-08.
How severe is CVE-2018-4219?: High severity. CVSS v3 base score is 7.8 out of 10.