CVE-2025-31257
📋 TL;DR
This CVE describes a memory handling vulnerability in Apple's WebKit browser engine that could cause Safari to crash when processing malicious web content. It affects multiple Apple operating systems and devices. The issue allows denial of service through browser crashes but does not appear to enable arbitrary code execution.
💻 Affected Systems
- Safari
- iOS
- iPadOS
- macOS
- watchOS
- tvOS
- 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
Safari crashes repeatedly when visiting malicious websites, causing denial of service and potential data loss from unsaved browser sessions.
Likely Case
Temporary browser crashes when encountering specially crafted web content, disrupting user workflow but not leading to system compromise.
If Mitigated
Browser restarts automatically after crash with minimal impact beyond temporary inconvenience.
🎯 Exploit Status
Exploitation requires user to visit malicious website but no authentication needed. Apple has not disclosed exploit details.
🛠️ 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. Navigate to General > Software Update. 3. Download and install available updates. 4. Restart device when prompted.
🔧 Temporary Workarounds
Disable JavaScript
allPrevents execution of malicious JavaScript that could trigger the vulnerability
Safari: Safari > Settings > Security > uncheck 'Enable JavaScript'
Use Alternative Browser
allSwitch to non-WebKit based browsers until patches are applied
🧯 If You Can't Patch
- Implement web content filtering to block known malicious sites
- Educate users to avoid clicking unknown links and use browser sandboxing features
🔍 How to Verify
Check if Vulnerable:
Check current OS version against affected versions listCheck Version:
iOS/iPadOS: Settings > General > About > Version; macOS: Apple menu > About This Mac; Safari: Safari > About SafariVerify Fix Applied:
Verify OS version matches or exceeds patched versions listed in fix_official.patch_version📡 Detection & Monitoring
Log Indicators:
- Safari crash logs with WebKit process termination
- Unexpected browser restarts in user activity logs
Network Indicators:
- Multiple rapid connections to same malicious domain followed by connection drops
SIEM Query:
source="*safari*" AND ("crash" OR "terminated" OR "WebKit")🔗 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/11
- 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
- https://lists.debian.org/debian-lts-announce/2025/06/msg00016.html
