What is CVE-2018-4330?

CVE-2018-4330 is a high-severity vulnerability in Apple Iphone OS, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2019-01-11.

How severe is CVE-2018-4330?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2018-4330 known to be exploited?

10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Apple Iphone OS

CVE-2018-4330

In iOS before 11.4, a memory corruption issue exists and was addressed with improved memory handling.

Vulnerability class: Buffer Overflow

Published 2019-01-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.031 (87.3th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.031 · newest: 0.031 · change: 0.000

Affected products

Apple Iphone OS

Weakness classification (CWE)

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

Public proof-of-concept exploits

References

www.securitytracker.com/id/1041665 (VDB Entry, Third Party Advisory, vdb-entry)
support.apple.com/HT208848 (Vendor Advisory)
www.securityfocus.com/bid/105384 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-4330?: CVE-2018-4330 is a high-severity vulnerability in Apple Iphone OS, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2019-01-11.
How severe is CVE-2018-4330?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2018-4330 known to be exploited?: 10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.