CVE-2025-62854
📋 TL;DR
An uncontrolled resource consumption vulnerability in QNAP File Station 5 allows authenticated remote attackers to cause denial-of-service conditions. This affects users running vulnerable versions of File Station 5 on QNAP NAS devices. 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 service disruption of File Station functionality, potentially affecting file access and management services on the QNAP device.
Likely Case
Degraded performance or temporary unavailability of File Station services until resource consumption subsides.
If Mitigated
Minimal impact with proper authentication controls and monitoring in place to detect abnormal resource usage.
🎯 Exploit Status
Exploitation requires valid user credentials. The vulnerability involves resource consumption which typically doesn't require complex exploitation techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: File Station 5 version 5.5.6.5190 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. 2. Go to App Center. 3. Check for updates for File Station 5. 4. Install version 5.5.6.5190 or later. 5. Restart File Station service or reboot the NAS if required.
🔧 Temporary Workarounds
Disable File Station 5
allTemporarily disable File Station 5 if not required for operations
Log into QNAP web interface > App Center > File Station 5 > Disable
Restrict Access
allLimit File Station access to trusted networks only
Control Panel > Network & File Services > Win/Mac/NFS > Configure access restrictions
🧯 If You Can't Patch
- Implement strict authentication controls and monitor for credential compromise
- Deploy resource monitoring and alerting for abnormal File Station resource consumption
🔍 How to Verify
Check if Vulnerable:
Check File Station version in QNAP App Center. If version is earlier than 5.5.6.5190, the system is vulnerable.Check Version:
Log into QNAP web interface > App Center > File Station 5 > Check version informationVerify Fix Applied:
Verify File Station version shows 5.5.6.5190 or later in App Center after update.📡 Detection & Monitoring
Log Indicators:
- Unusual high resource consumption by File Station processes
- Multiple failed authentication attempts followed by successful login and resource spikes
Network Indicators:
- Abnormal traffic patterns to File Station service ports
- Repeated resource-intensive requests to File Station endpoints
SIEM Query:
source="qnap_nas" AND (process="filestation" OR service="File Station") AND (cpu_usage>90 OR memory_usage>90)