CVE-2025-43353
📋 TL;DR
This CVE describes a heap corruption vulnerability in macOS that occurs when processing maliciously crafted strings. Attackers could potentially execute arbitrary code or cause application crashes. Affected users are those running vulnerable versions of macOS Sonoma and 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 →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
Remote code execution leading to full system compromise, data theft, or persistent malware installation
Likely Case
Application crash or denial of service, potentially leading to data loss or system instability
If Mitigated
No impact if patched; limited to denial of service if exploit attempts are detected and blocked
🎯 Exploit Status
Exploitation requires crafting specific malicious strings and getting them processed by vulnerable systems. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Sonoma 14.8 or macOS Sequoia 15.7
Vendor Advisory: https://support.apple.com/en-us/125111
Restart Required: No
Instructions:
1. Open System Settings 2. Click General 3. Click Software Update 4. Install available updates 5. Follow on-screen instructions
🔧 Temporary Workarounds
Application Sandboxing
macOSRun potentially vulnerable applications in sandboxed environments to limit impact
🧯 If You Can't Patch
- Implement strict input validation for string processing in applications
- Use endpoint detection and response (EDR) solutions to monitor for heap corruption attempts
🔍 How to Verify
Check if Vulnerable:
Check macOS version in System Settings > General > About. If version is Sonoma < 14.8 or Sequoia < 15.7, system is vulnerable.Check Version:
sw_versVerify Fix Applied:
Verify macOS version is Sonoma 14.8 or Sequoia 15.7 or later in System Settings > General > About📡 Detection & Monitoring
Log Indicators:
- Application crashes with heap corruption errors
- Unexpected termination of string processing applications
Network Indicators:
- Unusual network traffic containing crafted strings to macOS systems
SIEM Query:
source="macos" AND (event="application_crash" OR event="heap_corruption")