What is CVE-2018-4305?

CVE-2018-4305 is a medium-severity vulnerability in Apple Iphone OS, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2019-04-03.

How severe is CVE-2018-4305?

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

Improper input validation in Apple Iphone OS

CVE-2018-4305

An input validation issue was addressed with improved input validation. This issue affected versions prior to iOS 12, tvOS 12, watchOS 5.

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:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (43.9th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Apple Iphone OS
Apple tvOS
Apple watchOS
iOS, tvOS, watchOS — versions Versions prior to: iOS 12, tvOS 12, watchOS 5

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

support.apple.com/kb/HT209107 (Vendor Advisory)
support.apple.com/kb/HT209106 (Vendor Advisory)
support.apple.com/kb/HT209108 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-4305?: CVE-2018-4305 is a medium-severity vulnerability in Apple Iphone OS, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2019-04-03.
How severe is CVE-2018-4305?: Medium severity. CVSS v3 base score is 6.5 out of 10.