CVE-2020-9939

Name: CVE-2020-9939
Creator: NVD / NIST
Published: 2020-10-22T19:15:15.527+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.4/10EPSS 0.18%

Last modified Jun 17, 2026

CVE-2020-9939 is a medium-severity vulnerability rated 6.4/10 on the CVSS scale. This issue was addressed with improved checks. This issue is fixed in macOS Catalina 10.15.6. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

This issue was addressed with improved checks. This issue is fixed in macOS Catalina 10.15.6. A local user may be able to load unsigned kernel extensions.

Metrics

CVSS 3.1

6.4/10

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.18%

7.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-367

Affected Software

Vendor	Product	Versions
Apple	Mac Os X	< 10.15.6

References

https://support.apple.com/kb/HT211289Vendor Advisory
https://support.apple.com/kb/HT211289Vendor Advisory

Timeline

Published: Oct 22, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-9939?

This issue was addressed with improved checks. This issue is fixed in macOS Catalina 10.15.6. A local user may be able to load unsigned kernel extensions.

How severe is CVE-2020-9939?

CVE-2020-9939 has a CVSS score of 6.4/10 (MEDIUM severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.

How do I fix CVE-2020-9939?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-9939?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST