What is CVE-2018-4147?

CVE-2018-4147 is a critical-severity vulnerability in Apple Icloud, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2019-01-11.

How severe is CVE-2018-4147?

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

Buffer overflow in Apple Icloud

CVE-2018-4147

In iCloud for Windows before 7.3, Safari before 11.0.3, iTunes before 12.7.3 for Windows, and iOS before 11.2.5, multiple memory corruption issues exist and were 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 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: 0.015 (74.0th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Weakness classification (CWE)

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

References

support.apple.com/HT208473 (Vendor Advisory)
support.apple.com/HT208474 (Vendor Advisory)
support.apple.com/HT208475 (Vendor Advisory)
support.apple.com/HT208465 (Vendor Advisory)
support.apple.com/HT208463 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-4147?: CVE-2018-4147 is a critical-severity vulnerability in Apple Icloud, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2019-01-11.
How severe is CVE-2018-4147?: Critical severity. CVSS v3 base score is 9.8 out of 10.