What is CVE-2020-27901?

CVE-2020-27901 is a medium-severity vulnerability in Apple macOS, classified under Incorrect Authorization. CVSS score: 6.3/10. Published 2021-04-02.

How severe is CVE-2020-27901?

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

Auth bypass in Apple macOS

CVE-2020-27901

A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave, macOS Big Sur 11.0.1. A sandboxed process may be able to circumvent sandbox restrictions.

Vulnerability class: Broken Access Control

Published 2021-04-02 · 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:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Apple macOS — versions unspecified

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

support.apple.com/en-us/HT211931 (Vendor Advisory)
support.apple.com/en-us/HT212011 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-27901?: CVE-2020-27901 is a medium-severity vulnerability in Apple macOS, classified under Incorrect Authorization. CVSS score: 6.3/10. Published 2021-04-02.
How severe is CVE-2020-27901?: Medium severity. CVSS v3 base score is 6.3 out of 10.