CVE-2025-43209
📋 TL;DR
This is a critical out-of-bounds memory access vulnerability in Apple's Safari browser across multiple Apple operating systems. Processing malicious web content can cause Safari to crash unexpectedly, potentially allowing attackers to execute arbitrary code. All users running vulnerable versions of macOS, iOS, iPadOS, tvOS, watchOS, and visionOS are affected.
💻 Affected Systems
- Safari browser
📦 What is this software?
Ipados by Apple
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 →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 →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 →Tvos by Apple
Watchos by Apple
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Safari crashes and potential denial of service, with possible information disclosure through memory corruption.
If Mitigated
Safari crashes but no further exploitation due to sandboxing and other security controls.
🎯 Exploit Status
Exploitation requires user to visit malicious website or view malicious content. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Sequoia 15.6, iPadOS 17.7.9, iOS 18.6 and iPadOS 18.6, tvOS 18.6, macOS Sonoma 14.7.7, watchOS 11.6, visionOS 2.6, macOS Ventura 13.7.7
Vendor Advisory: https://support.apple.com/en-us/124147
Restart Required: Yes
Instructions:
1. Open System Settings (macOS) or Settings (iOS/iPadOS). 2. Navigate to General > Software Update. 3. Install the latest available update. 4. Restart the device when prompted.
🔧 Temporary Workarounds
Disable Safari JavaScript
allDisabling JavaScript reduces attack surface but breaks most websites
Safari > Settings > Security > uncheck 'Enable JavaScript'
Use alternative browser
allTemporarily use Chrome, Firefox, or other browsers until patched
🧯 If You Can't Patch
- Restrict web browsing to trusted sites only
- Implement network filtering to block malicious content delivery
🔍 How to Verify
Check if Vulnerable:
Check current OS version against vulnerable versions listed in affected_systemsCheck Version:
macOS: sw_vers -productVersion, iOS/iPadOS: Settings > General > About > VersionVerify Fix Applied:
Verify OS version matches or exceeds patch_version listed above📡 Detection & Monitoring
Log Indicators:
- Safari crash logs with memory access violations
- Unexpected Safari termination events
Network Indicators:
- Unusual web traffic patterns to suspicious domains
- Multiple Safari crash events from same source
SIEM Query:
source="safari_crash.log" AND ("out_of_bounds" OR "memory_access" OR "segmentation_fault")🔗 References
- https://support.apple.com/en-us/124147
- https://support.apple.com/en-us/124148
- https://support.apple.com/en-us/124149
- https://support.apple.com/en-us/124150
- https://support.apple.com/en-us/124151
- 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/Jul/31
- http://seclists.org/fulldisclosure/2025/Jul/32
- http://seclists.org/fulldisclosure/2025/Jul/33
- http://seclists.org/fulldisclosure/2025/Jul/34
- http://seclists.org/fulldisclosure/2025/Jul/36
- http://seclists.org/fulldisclosure/2025/Jul/37
