CVE-2021-30983 Apple iOS and iPadOS Buffer Overflow
A buffer overflow allows an application to execute arbitrary code with kernel privileges on iOS and iPadOS devices.
- Exploited in the wild
- Since 27 Jun 2022
- 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-2021-30983?
CVE-2021-30983 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
A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 15.2 and iPadOS 15.2. An application may be able to execute arbitrary code with kernel privileges.
Weakness: CWE-120
Which versions are affected by CVE-2021-30983?
It affects 2 products.
Products include Apple Ipados, Apple Iphone Os.
How do I fix CVE-2021-30983?
No fix has been published for CVE-2021-30983 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 18 Jul 2022.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-30983 being exploited?
Yes. Attackers have exploited CVE-2021-30983 in the wild since at least 27 Jun 2022.
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