CVE-2021-30952 Apple Multiple Products Integer Overflow or Wraparound
Processing maliciously crafted web content may lead to arbitrary code execution due to an integer overflow in Apple's web rendering engine.
- Exploited in the wild
- Since 5 Mar 2026
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-30952?
CVE-2021-30952 is a high-severity vulnerability in Apple Ipados, published on 24 Aug 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
An integer overflow was addressed with improved input validation. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.
Weakness: CWE-190
Which versions are affected by CVE-2021-30952?
It affects 10 products.
Products include Apple Ipados, Apple Iphone Os, Apple Macos, Apple Safari, Apple Tvos, Apple Watchos and 4 more.
How do I fix CVE-2021-30952?
Upgrade to a fixed version. US federal agencies must fix it by 26 Mar 2026.
Is CVE-2021-30952 being exploited?
Yes. Attackers have exploited CVE-2021-30952 in the wild since at least 5 Mar 2026.
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-2021-30952, UBUNTU-CVE-2021-30952.