What is CVE-2018-4356?

CVE-2018-4356 is a medium-severity vulnerability in Apple Iphone OS. CVSS score: 5.3/10. Published 2019-04-03.

How severe is CVE-2018-4356?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Apple Iphone OS

CVE-2018-4356

A permissions issue existed. This issue was addressed with improved permission validation. This issue affected versions prior to iOS 12.

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

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (62.3th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Apple Iphone OS
iOS — versions Versions prior to: iOS 12

References

support.apple.com/kb/HT209106 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-4356?: CVE-2018-4356 is a medium-severity vulnerability in Apple Iphone OS. CVSS score: 5.3/10. Published 2019-04-03.
How severe is CVE-2018-4356?: Medium severity. CVSS v3 base score is 5.3 out of 10.