What is CVE-2020-9804?

CVE-2020-9804 is a medium-severity vulnerability in Apple macOS. CVSS score: 4.6/10. Published 2020-06-09.

How severe is CVE-2020-9804?

Medium severity. CVSS v3 base score is 4.6 out of 10.

Vulnerability in Apple macOS

CVE-2020-9804

A logic issue was addressed with improved restrictions. This issue is fixed in macOS Catalina 10.15.5. Inserting a USB device that sends invalid messages may cause a kernel panic.

Published 2020-06-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (20.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.000

Affected products

Apple macOS — versions unspecified
Apple Mac OS X

References

support.apple.com/HT211170 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2020-9804?: CVE-2020-9804 is a medium-severity vulnerability in Apple macOS. CVSS score: 4.6/10. Published 2020-06-09.
How severe is CVE-2020-9804?: Medium severity. CVSS v3 base score is 4.6 out of 10.