What is CVE-2021-1824?

CVE-2021-1824 is a medium-severity vulnerability in Apple macOS. CVSS score: 4.4/10. Published 2021-09-08.

How severe is CVE-2021-1824?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in Apple macOS

CVE-2021-1824

This issue was addressed with improved entitlements. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina. A malicious application with root privileges may be able to access private information.

Published 2021-09-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (21.0th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.0% 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 — versions 10.15.6, 10.15.7

References

support.apple.com/en-us/HT212325 (Vendor Advisory)
support.apple.com/en-us/HT212326 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-1824?: CVE-2021-1824 is a medium-severity vulnerability in Apple macOS. CVSS score: 4.4/10. Published 2021-09-08.
How severe is CVE-2021-1824?: Medium severity. CVSS v3 base score is 4.4 out of 10.