CVE-2021-1870 Apple iOS, iPadOS, and macOS WebKit Remote Code Execution
A logic issue in Apple operating systems allows remote attackers to execute arbitrary code, with evidence of active exploitation.
- Exploited in the wild
- Since 3 Nov 2021
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-1870?
CVE-2021-1870 is a critical vulnerability in Apple Ipados, published on 2 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
Which versions are affected by CVE-2021-1870?
It affects 6 products.
Products include Apple Ipados, Apple Iphone Os, Apple Mac Os X, Apple Macos, Fedoraproject Fedora, Webkitgtk Webkitgtk.
How do I fix CVE-2021-1870?
Apply the vendor's patch. US federal agencies must fix it by 17 Nov 2021.
Is CVE-2021-1870 being exploited?
Yes. Attackers have exploited CVE-2021-1870 in the wild since at least 3 Nov 2021.
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-2021-1870, GHSA-f8fh-g8mv-p7hh, UBUNTU-CVE-2021-1870.