CVE-2025-43511
📋 TL;DR
This CVE describes a use-after-free vulnerability in Apple's WebKit browser engine that affects multiple Apple operating systems and Safari. Processing malicious web content can cause unexpected process crashes, potentially leading to denial of service or arbitrary code execution. Users of affected Apple devices and software are at risk.
💻 Affected Systems
- Safari
- WebKit
📦 What is this software?
Ipados by Apple
⚠️ Risk & Real-World Impact
Worst Case
Arbitrary code execution with the privileges of the affected process, potentially leading to full system compromise if combined with other vulnerabilities.
Likely Case
Unexpected process crash (denial of service) when visiting malicious websites, disrupting user experience and potentially causing data loss.
If Mitigated
Process isolation and sandboxing limit impact to the affected browser tab or process, preventing system-wide compromise.
🎯 Exploit Status
Use-after-free vulnerabilities typically require careful memory manipulation but can be exploited via crafted web content without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: watchOS 26.2, Safari 26.2, iOS 26.2, iPadOS 26.2, macOS Tahoe 26.2, iOS 18.7.2, iPadOS 18.7.2, visionOS 26.2
Vendor Advisory: https://support.apple.com/en-us/125633
Restart Required: Yes
Instructions:
1. Open System Settings/Preferences. 2. Navigate to Software Update. 3. Install all available updates. 4. Restart the 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 browsers not using WebKit engine until patched
Install Firefox, Chrome, or other non-WebKit browsers
🧯 If You Can't Patch
- Implement web content filtering to block malicious sites
- Use application whitelisting to restrict browser execution
🔍 How to Verify
Check if Vulnerable:
Check current OS version against affected versions listed in Apple advisoriesCheck Version:
macOS: sw_vers -productVersion; iOS/iPadOS: Settings → General → About → Version; Safari: Safari → About SafariVerify Fix Applied:
Verify OS version is equal to or greater than patched versions listed in fix_official.patch_version📡 Detection & Monitoring
Log Indicators:
- Unexpected Safari/WebKit process crashes
- Memory access violation errors in system logs
Network Indicators:
- Connections to known malicious domains serving crafted web content
SIEM Query:
source="system.log" AND (process="Safari" OR process="WebKit") AND (event="crash" OR event="segfault")