CVE-2021-30836 Information disclosure in iOS and iPadOS
An out-of-bounds read in Apple iOS allows attackers to disclose restricted memory by processing a maliciously crafted audio file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-30836?
CVE-2021-30836 is a medium-severity vulnerability in Apple Ipados, published on 28 Oct 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 read was addressed with improved input validation. This issue is fixed in iOS 14.8 and iPadOS 14.8, tvOS 15, watchOS 8, iOS 15 and iPadOS 15. Processing a maliciously crafted audio file may disclose restricted memory.
Weakness: CWE-125
Which versions are affected by CVE-2021-30836?
It affects 6 products.
Products include Apple Ipados, Apple Iphone Os, Apple Macos, Apple Safari, Apple Tvos, Apple Watchos.
How do I fix CVE-2021-30836?
Upgrade to a fixed version.
Is CVE-2021-30836 being exploited?
There is no known exploitation of CVE-2021-30836 in the wild and no public exploit code.
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
Sources
Also known as DEBIAN-CVE-2021-30836, GHSA-92w6-fxxp-58w5, UBUNTU-CVE-2021-30836.