CVE-2025-31273
📋 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 Safari and all Apple operating systems that use WebKit for web content rendering. Users of unpatched Apple devices are vulnerable when browsing the web.
💻 Affected Systems
- Safari
- iOS
- iPadOS
- macOS
- 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
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, and persistent malware installation.
Likely Case
Browser compromise allowing session hijacking, credential theft, and installation of malicious extensions.
If Mitigated
Limited impact with proper sandboxing and memory protection features, potentially only browser crash.
🎯 Exploit Status
Exploitation requires memory corruption techniques but no authentication. No public exploit code known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Safari 18.6, macOS Sequoia 15.6, iOS 18.6, iPadOS 18.6, tvOS 18.6, watchOS 11.6, visionOS 2.6
Vendor Advisory: https://support.apple.com/en-us/124147
Restart Required: Yes
Instructions:
1. Open System Settings/Preferences 2. Go to Software Update 3. Install all available updates 4. Restart device when prompted
🔧 Temporary Workarounds
Disable JavaScript
allPrevents execution of malicious JavaScript that could trigger the vulnerability
Safari: Settings > Security > Disable JavaScript
Use Alternative Browser
allSwitch to non-WebKit browsers like Chrome or Firefox
🧯 If You Can't Patch
- Implement web filtering to block known malicious sites
- Use application control to restrict browser execution in sensitive environments
🔍 How to Verify
Check if Vulnerable:
Check Safari version: Safari > About Safari. Check OS version: Apple menu > About This Mac (macOS) or Settings > General > About (iOS/iPadOS)Check Version:
macOS: sw_vers -productVersion, iOS: Settings > General > About > VersionVerify Fix Applied:
Verify version numbers match or exceed patched versions listed in fix_official.patch_version📡 Detection & Monitoring
Log Indicators:
- Safari/WebKit crash logs with memory corruption errors
- Unexpected browser process termination
Network Indicators:
- Connections to suspicious domains followed by browser crashes
- Unusual outbound traffic from browser processes
SIEM Query:
source="*safari*" AND (event="crash" OR event="memory_corruption")🔗 References
- https://support.apple.com/en-us/124147
- https://support.apple.com/en-us/124149
- https://support.apple.com/en-us/124152
- https://support.apple.com/en-us/124153
- https://support.apple.com/en-us/124154
- https://support.apple.com/en-us/124155
- http://seclists.org/fulldisclosure/2025/Aug/0
- http://seclists.org/fulldisclosure/2025/Jul/30
- http://seclists.org/fulldisclosure/2025/Jul/32
- http://seclists.org/fulldisclosure/2025/Jul/36
- http://www.openwall.com/lists/oss-security/2025/08/02/1
- https://lists.debian.org/debian-lts-announce/2025/08/msg00015.html
