CVE-2025-43227
📋 TL;DR
This vulnerability in Apple's WebKit browser engine allows malicious web content to bypass security controls and access sensitive user information. It affects Safari and all Apple operating systems that use WebKit for web rendering. Users visiting compromised websites could have personal data exposed.
💻 Affected Systems
- Safari
- iOS
- iPadOS
- macOS Sequoia
- 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
Complete compromise of user's browsing data including passwords, cookies, session tokens, and personal information stored in browser.
Likely Case
Targeted information disclosure where attackers steal specific user data from vulnerable browser sessions.
If Mitigated
No impact if systems are fully patched or if users avoid untrusted websites.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious website) but no authentication. Apple has patched this before public disclosure, reducing likelihood of widespread exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Safari 18.6, iOS 18.6 and iPadOS 18.6, macOS Sequoia 15.6, 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. For Safari on macOS: Update through App Store or System Preferences.
🔧 Temporary Workarounds
Disable JavaScript
allPrevents malicious web content from executing JavaScript that could exploit the vulnerability.
Safari: Safari > Settings > Security > uncheck 'Enable JavaScript'
Use Alternative Browser
allTemporarily use non-WebKit browsers like Chrome or Firefox until systems are patched.
🧯 If You Can't Patch
- Implement web content filtering to block known malicious websites
- Enable enhanced browser security settings and disable unnecessary web features
🔍 How to Verify
Check if Vulnerable:
Check Safari version: Safari > About Safari. Check OS version: macOS: Apple menu > About This Mac; iOS/iPadOS: Settings > General > About.Check Version:
macOS: sw_vers; iOS/iPadOS: Settings > General > About > VersionVerify Fix Applied:
Verify version numbers match or exceed: Safari 18.6, iOS 18.6, iPadOS 18.6, macOS Sequoia 15.6, tvOS 18.6, watchOS 11.6, visionOS 2.6📡 Detection & Monitoring
Log Indicators:
- Unusual web process crashes
- Suspicious JavaScript execution patterns
- Unexpected data access from web processes
Network Indicators:
- Connections to known malicious domains serving web content
- Unusual data exfiltration from browser processes
SIEM Query:
source="*browser*" AND (event="crash" OR event="access_violation") AND process="WebKit"🔗 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/35
- 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
