CVE-2025-54150
📋 TL;DR
An uncontrolled resource consumption vulnerability in Qsync Central allows local attackers with user accounts to launch denial-of-service attacks by exhausting system resources. This affects all Qsync Central installations before version 5.0.0.4. Organizations using vulnerable versions are at risk of service disruption.
💻 Affected Systems
- Qsync Central
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption making Qsync Central unavailable, potentially affecting all synchronized data and dependent services
Likely Case
Degraded performance or temporary service outages affecting file synchronization capabilities
If Mitigated
Minimal impact with proper access controls and monitoring in place
🎯 Exploit Status
Exploitation requires existing user account access; resource exhaustion attacks are typically straightforward to execute
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Qsync Central 5.0.0.4 (2026/01/20) and later
Vendor Advisory: https://www.qnap.com/en/security-advisory/qsa-26-02
Restart Required: Yes
Instructions:
1. Log into QNAP App Center
2. Check for available updates
3. Install Qsync Central 5.0.0.4 or later
4. Restart Qsync Central service
🔧 Temporary Workarounds
Restrict User Account Access
allLimit user accounts to only trusted personnel and implement least privilege principles
Implement Resource Monitoring
allMonitor system resources and set alerts for abnormal consumption patterns
🧯 If You Can't Patch
- Implement strict access controls and audit all user accounts
- Deploy network segmentation to isolate Qsync Central from other critical systems
🔍 How to Verify
Check if Vulnerable:
Check Qsync Central version in QNAP App Center or via SSH: cat /etc/config/uLinux.conf | grep qsyncCheck Version:
cat /etc/config/uLinux.conf | grep "qsync.*version"Verify Fix Applied:
Verify version is 5.0.0.4 or later and monitor for resource consumption anomalies📡 Detection & Monitoring
Log Indicators:
- Unusual resource consumption patterns
- Multiple failed synchronization attempts
- Service restart events
Network Indicators:
- Increased network traffic to Qsync Central
- Timeout errors from synchronization clients
SIEM Query:
source="qsync.log" AND ("resource exhaustion" OR "high memory" OR "high cpu")