What is CVE-2019-8663?

CVE-2019-8663 is a medium-severity vulnerability in Apple iOS. CVSS score: 5.3/10. Published 2019-12-18.

How severe is CVE-2019-8663?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Apple iOS

CVE-2019-8663

This issue was addressed with improved checks. This issue is fixed in iOS 12.4, macOS Mojave 10.14.6. A remote attacker may be able to leak memory.

Published 2019-12-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.067 (93.7th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.067 · newest: 0.067 · change: 0.000

Affected products

Apple iOS — versions unspecified
Apple Iphone OS
Apple macOS — versions unspecified
Apple Mac OS X

References

support.apple.com/HT210346 (Vendor Advisory)
support.apple.com/HT210348 (Vendor Advisory)

Frequently asked questions

What is CVE-2019-8663?: CVE-2019-8663 is a medium-severity vulnerability in Apple iOS. CVSS score: 5.3/10. Published 2019-12-18.
How severe is CVE-2019-8663?: Medium severity. CVSS v3 base score is 5.3 out of 10.