What is CVE-2018-4091?

CVE-2018-4091 is a critical-severity vulnerability in Apple Mac OS X. CVSS score: 10.0/10. Published 2018-04-03.

How severe is CVE-2018-4091?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Vulnerability in Apple Mac OS X

CVE-2018-4091

An issue was discovered in certain Apple products. macOS before 10.13.3 is affected. The issue involves the "Sandbox" component. It allows bypass of a sandbox protection mechanism.

Published 2018-04-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.9th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Apple Mac OS X

References

support.apple.com/HT208465 (Vendor Advisory)
www.securityfocus.com/bid/102785 (VDB Entry, Third Party Advisory, vdb-entry)
www.securitytracker.com/id/1040267 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-4091?: CVE-2018-4091 is a critical-severity vulnerability in Apple Mac OS X. CVSS score: 10.0/10. Published 2018-04-03.
How severe is CVE-2018-4091?: Critical severity. CVSS v3 base score is 10.0 out of 10.