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CVE-2021-30668: 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.

CVE-2021-30668 · published 5 years ago

Summary

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.

What to do

Update apple macos to version 11.4 or later.

Affected software

Vendor	Product	Affected versions
apple	macos	< 11.4 `cpe:2.3:o:apple:macos::::::::`

Original advisory text

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.

References

https://support.apple.com/en-us/HT212529 Release Notes Vendor Advisory

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit (estimated)
Gives an attacker partial control (estimated)

Severity

4.6 Medium

Exploitation

<1% chance of attack within 30 days

Type

CWE-287Improper Authentication

Timeline

Published8 Sep 2021

Updated4 Nov 2026

First seen29 Sep 2026

Sources

CVE-2021-30668 · NVD

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