CVE-2025-43494 Denial of service in iOS and iPadOS
An attacker can cause a persistent denial-of-service via mail header parsing flaws in Apple operating systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-43494?
CVE-2025-43494 is a high-severity denial of service vulnerability in Apple Ipados, published on 12 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A mail header parsing issue was addressed with improved checks. This issue is fixed in iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Sequoia 15.7.2, macOS Sonoma 14.8.2, macOS Tahoe 26.1, visionOS 26.1, watchOS 26.1. An attacker may be able to cause a persistent denial-of-service.
Weakness: CWE-20
Which versions are affected by CVE-2025-43494?
It affects 5 products.
Products include Apple Ipados, Apple Iphone Os, Apple Macos, Apple Visionos, Apple Watchos.
How do I fix CVE-2025-43494?
No fix has been published for CVE-2025-43494 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-43494 being exploited?
There is no known exploitation of CVE-2025-43494 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 GHSA-4444-xfvc-v5mv.