CVE-2021-30900 Apple iOS, iPadOS, and macOS Out-of-Bounds Write
A malicious application can execute arbitrary code with kernel privileges due to an out-of-bounds write vulnerability in iOS and iPadOS.
- Exploited in the wild
- Since 30 Mar 2023
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-30900?
CVE-2021-30900 is a high-severity memory corruption vulnerability in Apple Ipados, published on 24 Aug 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.
Weakness: CWE-787
Which versions are affected by CVE-2021-30900?
It affects 3 products.
Products include Apple Ipados, Apple Iphone Os, Apple Macos.
How do I fix CVE-2021-30900?
No fix has been published for CVE-2021-30900 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 20 Apr 2023.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-30900 being exploited?
Yes. Attackers have exploited CVE-2021-30900 in the wild since at least 30 Mar 2023.
Other vulnerabilities in Apple Ipados
- CVE-2025-43300 Apple iOS, iPadOS, and macOS Out-of-Bounds Write
- CVE-2025-24201 Apple Multiple Products WebKit Out-of-Bounds Write
- CVE-2025-24085 Apple Multiple Products Use-After-Free
- CVE-2025-31200 Apple Multiple Products Memory Corruption
- CVE-2025-31201 Apple Multiple Products Arbitrary Read and Write