CVE-2025-53410
📋 TL;DR
This vulnerability in QNAP File Station 5 allows authenticated remote attackers to exhaust system resources, potentially causing denial-of-service conditions. Attackers with valid user credentials can prevent legitimate users and processes from accessing shared resources. Organizations using vulnerable QNAP NAS devices with File Station 5 are affected.
💻 Affected Systems
- QNAP File Station 5
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system resource exhaustion leading to service unavailability, data corruption, or system crashes affecting all users and services on the NAS device.
Likely Case
Degraded performance or temporary unavailability of File Station services, impacting file sharing and management capabilities.
If Mitigated
Minimal impact with proper access controls, monitoring, and resource limits in place.
🎯 Exploit Status
Requires valid user credentials. Resource exhaustion attacks are typically straightforward to execute once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: File Station 5 5.5.6.5018 and later
Vendor Advisory: https://www.qnap.com/en/security-advisory/qsa-25-38
Restart Required: Yes
Instructions:
1. Log into QNAP NAS web interface. 2. Go to App Center. 3. Check for updates. 4. Update File Station 5 to version 5.5.6.5018 or later. 5. Restart the NAS if prompted.
🔧 Temporary Workarounds
Disable File Station 5
allTemporarily disable File Station 5 if not required for operations
Log into QNAP web interface > App Center > Find File Station 5 > Click 'Disable'
Restrict network access
allLimit access to File Station service to trusted networks only
QNAP web interface > Control Panel > Network & File Services > Win/Mac/NFS > Configure access restrictions
🧯 If You Can't Patch
- Implement strict access controls and limit user privileges to only necessary functions
- Enable resource monitoring and alerts for unusual resource consumption patterns
🔍 How to Verify
Check if Vulnerable:
Check File Station version in QNAP App Center. If version is below 5.5.6.5018, the system is vulnerable.Check Version:
ssh admin@nas-ip 'cat /etc/config/uLinux.conf | grep FileStation' or check via QNAP web interface App CenterVerify Fix Applied:
Confirm File Station version shows 5.5.6.5018 or higher in App Center after update.📡 Detection & Monitoring
Log Indicators:
- Unusually high resource usage logs
- Multiple failed resource allocation attempts
- User sessions consuming excessive memory/CPU
Network Indicators:
- Abnormal number of File Station connections from single source
- Sustained high-volume requests to File Station API
SIEM Query:
source="qnap_nas" AND (resource_usage>90% OR process="FileStation" AND memory_usage>threshold)