CVE-2025-29876
📋 TL;DR
A NULL pointer dereference vulnerability in QNAP File Station 5 allows authenticated attackers to cause denial-of-service by crashing the service. This affects organizations using vulnerable versions of QNAP File Station for file management. Attackers need valid user credentials to exploit this vulnerability.
💻 Affected Systems
- QNAP File Station 5
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete disruption of File Station service, preventing file access and management for all users until service restart.
Likely Case
Temporary service interruption affecting file operations for authenticated users.
If Mitigated
Minimal impact with proper authentication controls and monitoring in place.
🎯 Exploit Status
Exploitation requires authenticated access. The vulnerability is a straightforward NULL pointer dereference that can be triggered to crash the service.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: File Station 5 5.5.6.4847 and later
Vendor Advisory: https://www.qnap.com/en/security-advisory/qsa-25-16
Restart Required: Yes
Instructions:
1. Log into QNAP QTS web interface. 2. Go to App Center. 3. Check for updates for File Station. 4. Install version 5.5.6.4847 or later. 5. Restart the File Station service or the NAS device.
🔧 Temporary Workarounds
Disable File Station
allTemporarily disable File Station service if not required
Restrict Access
allLimit File Station access to trusted networks using firewall rules
🧯 If You Can't Patch
- Implement strict access controls and monitor for unauthorized authentication attempts
- Enable logging and monitoring for File Station service crashes or unusual activity
🔍 How to Verify
Check if Vulnerable:
Check File Station version in QTS App Center or via SSH: cat /etc/config/uLinux.conf | grep file_station_versionCheck Version:
cat /etc/config/uLinux.conf | grep file_station_versionVerify Fix Applied:
Verify File Station version is 5.5.6.4847 or higher in App Center📡 Detection & Monitoring
Log Indicators:
- File Station service crash logs
- Unexpected service restarts
- Multiple failed authentication attempts followed by service disruption
Network Indicators:
- Sudden drop in File Station traffic
- Connection resets to File Station port
SIEM Query:
source="qnap_logs" AND ("File Station crashed" OR "service restart" OR "segmentation fault")