CVE-2021-30668: Apple macOS

Medium severity, CVSS 4.6. EPSS: 0.3% chance of exploitation in the next 30 days.

This issue was addressed with improved checks. This issue is fixed in macOS Big Sur 11.4. A person with physical access to a Mac may be able to bypass Login Window during a software update.

Affected products

• Apple macOS: before 11.4 (fixed in 11.4)

Published 2021-09-08. Last modified 2026-06-17.