What is CVE-2018-4388?

CVE-2018-4388 is a medium-severity vulnerability in Apple Iphone OS, classified under Information Disclosure. CVSS score: 4.6/10. Published 2019-04-03.

How severe is CVE-2018-4388?

Medium severity. CVSS v3 base score is 4.6 out of 10.

Information disclosure in Apple Iphone OS

CVE-2018-4388

A lock screen issue allowed access to the share function on a locked device. This issue was addressed by restricting options offered on a locked device. This issue affected versions prior to iOS 12.1.

Vulnerability class: Information Disclosure

Published 2019-04-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (23.4th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Apple Iphone OS
iOS — versions Versions prior to: iOS 12.1

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

support.apple.com/kb/HT209192 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-4388?: CVE-2018-4388 is a medium-severity vulnerability in Apple Iphone OS, classified under Information Disclosure. CVSS score: 4.6/10. Published 2019-04-03.
How severe is CVE-2018-4388?: Medium severity. CVSS v3 base score is 4.6 out of 10.