What is CVE-2018-4354?

CVE-2018-4354 is a high-severity vulnerability in Apple Iphone OS, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.6/10. Published 2019-04-03.

How severe is CVE-2018-4354?

High severity. CVSS v3 base score is 8.6 out of 10.

Buffer overflow in Apple Iphone OS

CVE-2018-4354

A memory corruption issue was addressed with improved memory handling. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5.

Vulnerability class: Buffer Overflow

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

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (59.1th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Apple Iphone OS
Apple Mac OS X
Apple tvOS
Apple watchOS
iOS, macOS, tvOS, watchOS — versions Versions prior to: iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

support.apple.com/kb/HT209107 (Vendor Advisory)
support.apple.com/kb/HT209193 (Vendor Advisory)
support.apple.com/kb/HT209106 (Vendor Advisory)
support.apple.com/kb/HT209139 (Vendor Advisory)
support.apple.com/kb/HT209108 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-4354?: CVE-2018-4354 is a high-severity vulnerability in Apple Iphone OS, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.6/10. Published 2019-04-03.
How severe is CVE-2018-4354?: High severity. CVSS v3 base score is 8.6 out of 10.