CVE-2021-30923

Severity: high (CVSS 7.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-24 · updated 2026-06-17
Weakness: CWE-362

Description

A race condition was addressed with improved locking. This issue is fixed in macOS Monterey 12.0.1. A malicious application may be able to execute arbitrary code with kernel privileges.

Affected products

Apple iPadOS: before 15.1 — fixed in 15.1
Apple Iphone Os: before 15.1 — fixed in 15.1
Apple macOS: before 12.0.1 — fixed in 12.0.1

How to fix

Upgrade to a fixed version: Apple iPadOS 15.1; Apple Iphone Os 15.1; Apple macOS 12.0.1. Check the vendor advisory for mitigations.

References

https://support.apple.com/en-us/HT212869
https://support.apple.com/kb/HT212867
https://support.apple.com/en-us/HT212869
https://support.apple.com/kb/HT212867

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