CVE-2025-43237
📋 TL;DR
This critical vulnerability in macOS allows an application to write data beyond allocated memory boundaries, potentially leading to system crashes or arbitrary code execution. It affects macOS systems before version 15.6 (Sequoia).
💻 Affected Systems
- macOS
📦 What is this software?
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 →⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with kernel-level code execution leading to persistent malware installation, data theft, and system control.
Likely Case
Application crashes, system instability, or denial of service through system termination.
If Mitigated
Limited impact with proper application sandboxing and privilege separation.
🎯 Exploit Status
Exploitation requires a malicious application to be installed and executed on the target system.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Sequoia 15.6
Vendor Advisory: https://support.apple.com/en-us/124149
Restart Required: Yes
Instructions:
1. Open System Settings 2. Click General 3. Click Software Update 4. Install macOS Sequoia 15.6 update 5. Restart when prompted
🔧 Temporary Workarounds
Application Restriction
allRestrict installation and execution of untrusted applications using macOS security controls.
🧯 If You Can't Patch
- Implement strict application allowlisting to prevent untrusted applications from running
- Enable full disk encryption and maintain regular backups in case of system compromise
🔍 How to Verify
Check if Vulnerable:
Check macOS version in System Settings > General > About. If version is earlier than 15.6, system is vulnerable.Check Version:
sw_versVerify Fix Applied:
Verify macOS version shows 15.6 or later in System Settings > General > About.📡 Detection & Monitoring
Log Indicators:
- Unexpected system termination logs in Console.app
- Kernel panic reports
- Application crash reports with memory access violations
Network Indicators:
- Unusual outbound connections from system processes after application execution
SIEM Query:
source="macos" AND (event_type="kernel_panic" OR message="out of bounds" OR message="bounds checking")