What is CVE-2019-8661?

CVE-2019-8661 is a critical-severity vulnerability in Apple macOS, classified under Use After Free. CVSS score: 9.8/10. Published 2019-12-18.

How severe is CVE-2019-8661?

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

Use After Free in Apple macOS

CVE-2019-8661

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Mojave 10.14.6. A remote attacker may be able to cause arbitrary code execution.

Vulnerability class: Use-After-Free

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

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.103 (95.6th percentile), scored 2026-10-02.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.103 · newest: 0.103 · change: 0.000

Affected products

Apple macOS — versions unspecified
Apple Mac OS X

Weakness classification (CWE)

CWE-416 — Use After Free

References

support.apple.com/HT210348 (Vendor Advisory)

Frequently asked questions

What is CVE-2019-8661?: CVE-2019-8661 is a critical-severity vulnerability in Apple macOS, classified under Use After Free. CVSS score: 9.8/10. Published 2019-12-18.
How severe is CVE-2019-8661?: Critical severity. CVSS v3 base score is 9.8 out of 10.