CVE-2025-43520
📋 TL;DR
This CVE describes a memory corruption vulnerability in Apple operating systems that could allow a malicious application to cause system crashes or write to kernel memory. It affects multiple Apple platforms including iOS, macOS, watchOS, visionOS, and tvOS. Users running affected versions are vulnerable to potential system instability or privilege escalation.
💻 Affected Systems
- iOS
- iPadOS
- macOS
- watchOS
- visionOS
- tvOS
📦 What is this software?
Ipados by Apple
Ipados by Apple
Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Tvos by Apple
Watchos by Apple
⚠️ Risk & Real-World Impact
Worst Case
A malicious application could achieve kernel-level code execution, potentially leading to full system compromise, data theft, or persistent backdoor installation.
Likely Case
Malicious applications could cause system crashes (denial of service) or achieve limited kernel memory manipulation, potentially leading to privilege escalation.
If Mitigated
With proper application sandboxing and security controls, impact would be limited to denial of service through system crashes.
🎯 Exploit Status
Exploitation requires a malicious application to be installed and executed on the target system. No public proof-of-concept has been disclosed at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: watchOS 26.1, iOS 18.7.2 and iPadOS 18.7.2, macOS Tahoe 26.1, visionOS 26.1, tvOS 26.1, macOS Sonoma 14.8.2, macOS Sequoia 15.7.2, iOS 26.1 and iPadOS 26.1
Vendor Advisory: https://support.apple.com/en-us/125632
Restart Required: Yes
Instructions:
1. Open Settings app. 2. Navigate to General > Software Update. 3. Download and install the latest available update. 4. Restart the device when prompted.
🔧 Temporary Workarounds
Application Restriction
allRestrict installation of untrusted applications to reduce attack surface
Enhanced Monitoring
allMonitor for unexpected system crashes or abnormal application behavior
🧯 If You Can't Patch
- Implement strict application allowlisting to prevent installation of untrusted applications
- Isolate affected devices from critical network segments and monitor for abnormal behavior
🔍 How to Verify
Check if Vulnerable:
Check the operating system version against the affected versions listed in the advisoryCheck Version:
On Apple devices: Settings > General > About > VersionVerify Fix Applied:
Verify that the device is running one of the patched versions listed in the fix information📡 Detection & Monitoring
Log Indicators:
- Unexpected system crashes or kernel panics
- Applications attempting to access kernel memory
Network Indicators:
- No specific network indicators as this is a local vulnerability
SIEM Query:
Search for kernel panic logs or unexpected system restarts on Apple devices🔗 References
- https://support.apple.com/en-us/125632
- https://support.apple.com/en-us/125633
- https://support.apple.com/en-us/125634
- https://support.apple.com/en-us/125635
- https://support.apple.com/en-us/125636
- https://support.apple.com/en-us/125637
- https://support.apple.com/en-us/125638
- https://support.apple.com/en-us/125639
