CVE-2025-54155
📋 TL;DR
This vulnerability in QNAP File Station 5 allows a remote attacker with administrator credentials to allocate system resources without limits, potentially causing denial of service by starving other processes of those resources. It affects all QNAP NAS devices running vulnerable versions of File Station 5. The vulnerability requires administrative access to exploit.
💻 Affected Systems
- QNAP File Station 5
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system resource exhaustion leading to denial of service, potentially affecting all services on the NAS device and requiring physical reboot.
Likely Case
Degraded performance or temporary unavailability of File Station and related services until resource consumption stops.
If Mitigated
Limited impact due to existing resource limits or monitoring catching abnormal consumption patterns.
🎯 Exploit Status
Exploitation requires administrative credentials. No public exploit code known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: File Station 5 version 5.5.6.5018 or later
Vendor Advisory: https://www.qnap.com/en/security-advisory/qsa-26-03
Restart Required: Yes
Instructions:
1. Log into QNAP NAS web interface as admin. 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 service if not required.
Log into QNAP web interface > Control Panel > Applications > App Center > Find File Station 5 > Click 'Stop'
Restrict admin access
allLimit administrative accounts and implement strong authentication controls.
Control Panel > Privilege > Users > Review admin accounts > Remove unnecessary admin privileges
🧯 If You Can't Patch
- Implement strict monitoring for abnormal resource consumption patterns
- Enforce principle of least privilege and review all administrative accounts
🔍 How to Verify
Check if Vulnerable:
Check File Station version in App Center. If version is below 5.5.6.5018, system is vulnerable.Check Version:
ssh admin@nas_ip 'cat /etc/config/uLinux.conf | grep app_version' or check via web interface App CenterVerify Fix Applied:
Verify File Station version shows 5.5.6.5018 or higher in App Center.📡 Detection & Monitoring
Log Indicators:
- Unusually high resource consumption by File Station processes
- Multiple admin login attempts followed by resource spikes
Network Indicators:
- Increased admin interface traffic preceding resource exhaustion
SIEM Query:
source="qnap_nas" (process="filestation" AND (resource_usage>90% OR memory_usage>90%))