What is CVE-2018-4367?

CVE-2018-4367 is a critical-severity vulnerability in Apple Iphone OS, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2019-04-03.

How severe is CVE-2018-4367?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Apple Iphone OS

CVE-2018-4367

A memory corruption issue was addressed with improved input validation. 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 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.065 (93.6th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.065 · newest: 0.065 · change: 0.000

Affected products

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

Weakness classification (CWE)

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

References

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

Frequently asked questions

What is CVE-2018-4367?: CVE-2018-4367 is a critical-severity vulnerability in Apple Iphone OS, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2019-04-03.
How severe is CVE-2018-4367?: Critical severity. CVSS v3 base score is 9.8 out of 10.