CVE-2021-30826

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-19 · updated 2026-06-17

Description

A logic issue was addressed with improved state management. This issue is fixed in iOS 15 and iPadOS 15. In certain situations, the baseband would fail to enable integrity and ciphering protection.

Affected products

Apple iPadOS: before 15.0 — fixed in 15.0
Apple Iphone Os: before 15.0 — fixed in 15.0

How to fix

Upgrade to a fixed version: Apple iPadOS 15.0; Apple Iphone Os 15.0. Check the vendor advisory for mitigations.

References

http://seclists.org/fulldisclosure/2021/Oct/61
https://support.apple.com/en-us/HT212814
https://support.apple.com/kb/HT212807
http://seclists.org/fulldisclosure/2021/Oct/61
https://support.apple.com/en-us/HT212814
https://support.apple.com/kb/HT212807

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