CVE-2025-31218
📋 TL;DR
This vulnerability allows applications to observe hostnames of new network connections on macOS systems, potentially exposing sensitive information about network activity. It affects macOS systems before version 15.5 (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
Malicious applications could monitor all network connection attempts, revealing internal infrastructure, visited websites, or communication patterns that could be used for targeted attacks.
Likely Case
Applications with excessive permissions could collect browsing history or network reconnaissance data, potentially leading to privacy violations or information disclosure.
If Mitigated
With proper application sandboxing and network permission controls, impact is limited to applications already granted network access.
🎯 Exploit Status
Exploitation requires a malicious application to be installed and running on the target system. No public exploit code has been identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Sequoia 15.5
Vendor Advisory: https://support.apple.com/en-us/122716
Restart Required: Yes
Instructions:
1. Open System Settings 2. Click General 3. Click Software Update 4. Install macOS Sequoia 15.5 update 5. Restart when prompted
🔧 Temporary Workarounds
Application Network Permission Review
macosReview and restrict network permissions for applications through macOS Privacy & Security settings
Open System Settings > Privacy & Security > Network > Review application permissions
🧯 If You Can't Patch
- Implement strict application control policies to prevent unauthorized applications from running
- Use network monitoring tools to detect unusual connection patterns or data exfiltration attempts
🔍 How to Verify
Check if Vulnerable:
Check macOS version: if version is earlier than 15.5, the system is vulnerableCheck Version:
sw_versVerify Fix Applied:
Verify macOS version is 15.5 or later and check that the update was successfully installed📡 Detection & Monitoring
Log Indicators:
- Unusual network connection monitoring by applications
- Excessive network permission requests
Network Indicators:
- Applications making unexpected DNS queries or connection attempts
SIEM Query:
process:network_connection_monitoring AND os:macos AND version:<15.5