What is CVE-2018-4439?

CVE-2018-4439 is a medium-severity vulnerability in Apple Icloud, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2019-04-03.

How severe is CVE-2018-4439?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Apple Icloud

CVE-2018-4439

A logic issue was addressed with improved validation. This issue affected versions prior to iOS 12.1.1, Safari 12.0.2, iTunes 12.9.2 for Windows, iCloud for Windows 7.9.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

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

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.019 (79.3th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Apple Icloud
Apple Iphone OS
Apple Itunes
Apple Safari
Microsoft Windows
iOS, Safari, Itunes For Windows, Icloud Windows — versions Versions prior to: iOS 12.1.1, Safari 12.0.2, iTunes 12.9.2 for Windows, iCloud for Windows 7.9

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

support.apple.com/kb/HT209340 (Vendor Advisory)
support.apple.com/kb/HT209344 (Vendor Advisory)
support.apple.com/kb/HT209346 (Vendor Advisory)
support.apple.com/kb/HT209345 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-4439?: CVE-2018-4439 is a medium-severity vulnerability in Apple Icloud, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2019-04-03.
How severe is CVE-2018-4439?: Medium severity. CVSS v3 base score is 6.5 out of 10.