What is CVE-2019-8855?

CVE-2019-8855 is a medium-severity vulnerability in Apple macOS. CVSS score: 6.3/10. Published 2020-10-27.

How severe is CVE-2019-8855?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Vulnerability in Apple macOS

CVE-2019-8855

An access issue was addressed with additional sandbox restrictions. This issue is fixed in macOS Catalina 10.15. A malicious application may be able to access restricted files.

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

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (53.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Apple macOS — versions unspecified
Apple Mac OS X

References

support.apple.com/en-us/HT210634 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2019-8855?: CVE-2019-8855 is a medium-severity vulnerability in Apple macOS. CVSS score: 6.3/10. Published 2020-10-27.
How severe is CVE-2019-8855?: Medium severity. CVSS v3 base score is 6.3 out of 10.