What’s Vulnerable › Vulnerabilities

CVE-2021-30869: Apple iOS, iPadOS, and macOS Type Confusion Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 4.1% 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-843

Description

A type confusion issue was addressed with improved state handling. This issue is fixed in iOS 12.5.5, iOS 14.4 and iPadOS 14.4, macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, Security Update 2021-006 Catalina. A malicious application may be able to execute arbitrary code with kernel privileges. Apple is aware of reports that an exploit for this issue exists in the wild.

Affected products

• Apple iPadOS: before 14.4 — fixed in 14.4
• Apple Iphone Os: from 12.0 before 12.5.5; from 14.0 before 14.4 — fixed in 12.5.5, 14.4
• macOS: from 10.14 through 10.14.6; from 10.15 through 10.15.6; 10.14.6-security_update_2019-001, 10.14.6-security_update_2019-002, 10.14.6-security_update_2019-004, 10.14.6-security_update_2019-005, 10.14.6-security_update_2019-006, 10.14.6-security_update_2019-007 (+17)
• Apple macOS: from 11.0 before 11.2 — fixed in 11.2

How to fix

Upgrade to a fixed version: Apple iPadOS 14.4; Apple Iphone Os 12.5.5, 14.4; Apple macOS 11.2. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT212146
• https://support.apple.com/en-us/HT212147
• https://support.apple.com/en-us/HT212824
• https://support.apple.com/en-us/HT212825
• https://support.apple.com/en-us/HT212146
• https://support.apple.com/en-us/HT212147
• https://support.apple.com/en-us/HT212824
• https://support.apple.com/en-us/HT212825
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30869

Get alerted when CVE-2021-30869 or the next vulnerability affects your stack