CVE-2025-31223
📋 TL;DR
This memory corruption vulnerability in Apple's WebKit browser engine allows attackers to execute arbitrary code by tricking users into visiting malicious websites. It affects all Apple devices running vulnerable versions of iOS, iPadOS, macOS, tvOS, watchOS, and visionOS. The vulnerability is particularly dangerous because it can be exploited through normal web browsing.
💻 Affected Systems
- Safari
- WebKit-based applications
📦 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
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise allowing remote code execution, data theft, and persistent malware installation.
Likely Case
Browser compromise leading to session hijacking, credential theft, and installation of surveillance malware.
If Mitigated
Limited impact with proper network segmentation, application sandboxing, and user education preventing malicious site visits.
🎯 Exploit Status
Memory corruption vulnerabilities in WebKit are frequently exploited in the wild. While no public PoC exists, similar vulnerabilities have been weaponized quickly in the past.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: watchOS 11.5, tvOS 18.5, iOS 18.5, iPadOS 18.5, macOS Sequoia 15.5, visionOS 2.5, Safari 18.5
Vendor Advisory: https://support.apple.com/en-us/122404
Restart Required: Yes
Instructions:
1. Open Settings app. 2. Go to General > Software Update. 3. Download and install the latest update. 4. Restart device when prompted.
🔧 Temporary Workarounds
Disable JavaScript
allTemporarily disable JavaScript in Safari to prevent exploitation through malicious web content.
Safari > Settings > Security > Uncheck 'Enable JavaScript'
Use Alternative Browser
allUse browsers not based on WebKit (like Firefox or Chrome on macOS) until patched.
🧯 If You Can't Patch
- Implement network filtering to block known malicious domains and restrict web browsing to trusted sites only.
- Enable application sandboxing and use endpoint protection with memory protection capabilities.
🔍 How to Verify
Check if Vulnerable:
Check current OS version in Settings > General > About > Software Version.Check Version:
On macOS: sw_vers -productVersion. On iOS/iPadOS: Settings > General > About > Version.Verify Fix Applied:
Verify installed version matches or exceeds the patched versions listed in the fix section.📡 Detection & Monitoring
Log Indicators:
- Safari/WebKit crash logs with memory corruption signatures
- Unexpected process spawning from Safari
Network Indicators:
- Outbound connections to suspicious domains following web browsing
- Unusual network traffic patterns from browser processes
SIEM Query:
process_name:"Safari" AND (event_type:crash OR parent_process_name:"Safari")🔗 References
- https://support.apple.com/en-us/122404
- https://support.apple.com/en-us/122716
- https://support.apple.com/en-us/122719
- https://support.apple.com/en-us/122720
- https://support.apple.com/en-us/122721
- https://support.apple.com/en-us/122722
- http://seclists.org/fulldisclosure/2025/May/10
- http://seclists.org/fulldisclosure/2025/May/12
- http://seclists.org/fulldisclosure/2025/May/13
- http://seclists.org/fulldisclosure/2025/May/5
- http://seclists.org/fulldisclosure/2025/May/7
