What is CVE-2018-4288?

CVE-2018-4288 is a critical-severity vulnerability in Apple Mac OS X, 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-2018-4288?

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

Buffer overflow in Apple Mac OS X

CVE-2018-4288

Multiple memory corruption issues were addressed with improved memory handling. This issue affected versions prior to macOS High Sierra 10.13.6.

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: 0.021 (80.6th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

Apple Mac OS X
macOS — versions Versions prior to: macOS High Sierra 10.13.6

Weakness classification (CWE)

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

References

support.apple.com/kb/HT209193 (Vendor Advisory)
support.apple.com/kb/HT208937 (Vendor Advisory)
packetstormsecurity.com/files/172831/macOS-NFS-Client-Buffer-Overflow.html

Frequently asked questions

What is CVE-2018-4288?: CVE-2018-4288 is a critical-severity vulnerability in Apple Mac OS X, 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-2018-4288?: Critical severity. CVSS v3 base score is 9.8 out of 10.