What is CVE-2018-4451?

CVE-2018-4451 is a high-severity vulnerability in Apple macOS. CVSS score: 7.8/10. Published 2020-10-27.

How severe is CVE-2018-4451?

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

Vulnerability in Apple macOS

CVE-2018-4451

This issue is fixed in macOS Mojave 10.14. A memory corruption issue was addressed with improved input validation.

Published 2020-10-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.3% 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 macOS — versions unspecified
Apple Mac OS X

References

support.apple.com/en-us/HT209139 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-4451?: CVE-2018-4451 is a high-severity vulnerability in Apple macOS. CVSS score: 7.8/10. Published 2020-10-27.
How severe is CVE-2018-4451?: High severity. CVSS v3 base score is 7.8 out of 10.