CVE-2025-43342
📋 TL;DR
This vulnerability in Apple's Safari browser and related operating systems allows processing malicious web content to cause unexpected process crashes. It affects users of Safari, iOS, iPadOS, tvOS, watchOS, and visionOS. The high CVSS score indicates potential for significant impact if exploited.
💻 Affected Systems
- Safari
- iOS
- iPadOS
- tvOS
- watchOS
- visionOS
📦 What is this software?
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 →Safari by Apple
Tvos by Apple
Watchos by Apple
Webkitgtk by Webkitgtk
Wpe Webkit by Wpewebkit
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via memory corruption leading to arbitrary code execution, potentially allowing attackers to take full control of affected devices.
Likely Case
Denial of service through application crashes when users visit malicious websites, disrupting normal device operation.
If Mitigated
Limited to application crashes without data loss if proper web content filtering and security controls are implemented.
🎯 Exploit Status
Exploitation requires user to visit malicious website but no authentication needed. Apple has patched this in multiple OS versions simultaneously.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Safari 26, tvOS 26, watchOS 26, iOS 26, iPadOS 26, visionOS 26, iOS 18.7, iPadOS 18.7
Vendor Advisory: https://support.apple.com/en-us/125108
Restart Required: Yes
Instructions:
1. Open Settings app on Apple device. 2. Navigate to General > Software Update. 3. Download and install the latest available update. 4. Restart device when prompted.
🔧 Temporary Workarounds
Disable JavaScript
allPrevents execution of malicious web content that could trigger the vulnerability
Safari: Settings > Advanced > Disable JavaScript
Use Content Filtering
allBlock access to untrusted websites using web filtering solutions
🧯 If You Can't Patch
- Implement strict web content filtering to block malicious sites
- Use alternative browsers temporarily and restrict Safari usage
🔍 How to Verify
Check if Vulnerable:
Check Safari version: Safari > About Safari. Check OS version: Settings > General > About > Software Version.Check Version:
iOS/iPadOS: Settings > General > About > Software Version. macOS: Apple menu > About This Mac > Software Version.Verify Fix Applied:
Verify installed version matches or exceeds patched versions listed in fix_official.patch_version📡 Detection & Monitoring
Log Indicators:
- Safari/WebKit crash logs
- Unexpected browser termination events
- Kernel panic logs following web browsing
Network Indicators:
- Requests to known malicious domains followed by application crashes
- Unusual web traffic patterns
SIEM Query:
source="*safari*" AND (event="crash" OR event="terminated") AND timestamp > [time_threshold]🔗 References
- https://support.apple.com/en-us/125108
- https://support.apple.com/en-us/125109
- https://support.apple.com/en-us/125113
- https://support.apple.com/en-us/125114
- https://support.apple.com/en-us/125115
- https://support.apple.com/en-us/125116
- http://seclists.org/fulldisclosure/2025/Sep/49
- http://seclists.org/fulldisclosure/2025/Sep/53
- http://seclists.org/fulldisclosure/2025/Sep/57
- http://seclists.org/fulldisclosure/2025/Sep/59
- http://www.openwall.com/lists/oss-security/2025/09/22/3
