What is CVE-2018-4365?

CVE-2018-4365 is a medium-severity vulnerability in Apple Iphone OS, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2019-04-03.

How severe is CVE-2018-4365?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Out-of-bounds Read in Apple Iphone OS

CVE-2018-4365

An out-of-bounds read was addressed with improved bounds checking. This issue affected versions prior to iOS 12.1.

Vulnerability class: Buffer Overflow

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

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (52.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

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

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

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

Frequently asked questions

What is CVE-2018-4365?: CVE-2018-4365 is a medium-severity vulnerability in Apple Iphone OS, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2019-04-03.
How severe is CVE-2018-4365?: Medium severity. CVSS v3 base score is 5.5 out of 10.