Apple · iOS, iPadOS, and macOS
CVE-2021-30869
Apple iOS, iPadOS, and macOS Type Confusion Vulnerability
What it is
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.
CISA: Apple iOS, iPadOS, and macOS contain a type confusion vulnerability in the XNU which may allow a malicious application to execute code with kernel privileges.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: November 17, 2021
More exploited flaws from Apple
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Aug 21, 2025 | Out-of-Bounds Write | iOS, iPadOS, and macOS | Critical 10.0 | 65% |
| Sep 11, 2023 | ImageIO Buffer Overflow | iOS, iPadOS, and macOS | High 7.8 | 53% |
| Apr 10, 2023 | IOSurfaceAccelerator Out-of-Bounds Write | iOS, iPadOS, and macOS | High 8.6 | 23% |
| Mar 30, 2023 | Out-of-Bounds Write | iOS, iPadOS, and macOS | High 7.8 | 5.2% |
| Sep 14, 2022 | Remote Code Execution | iOS, iPadOS, and macOS | High 7.8 | 5.6% |
| Sep 8, 2022 | Input Validation | iOS, iPadOS, and macOS | Medium 5.5 | 3.2% |
| Feb 11, 2022 | Webkit Use-After-Free | iOS, iPadOS, and macOS | High 8.8 | 16% |
| Nov 3, 2021 | WebKit Remote Code Execution | iOS, iPadOS, and macOS | Critical 9.8 | 7.7% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.