CVE-2025-54151
📋 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 unavailability of Qsync Central, disrupting file synchronization services and potentially affecting dependent business processes.
Likely Case
Degraded performance or temporary service outages affecting file synchronization capabilities.
If Mitigated
Minimal impact with proper access controls and monitoring in place to detect resource exhaustion attempts.
🎯 Exploit Status
Exploitation requires local access with user credentials; specific exploit details not publicly disclosed.
🛠️ 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 updates to Qsync Central. 3. Install version 5.0.0.4 or later. 4. Restart Qsync Central service or the entire NAS if required.
🔧 Temporary Workarounds
Restrict User Account Access
allLimit Qsync Central user accounts to only trusted personnel and implement principle of least privilege.
Implement Resource Monitoring
allMonitor system resource usage and set alerts for abnormal consumption patterns.
🧯 If You Can't Patch
- Implement strict access controls and audit all user accounts with Qsync Central access
- Deploy network segmentation to isolate Qsync Central from critical systems and implement rate limiting
🔍 How to Verify
Check if Vulnerable:
Check Qsync Central version in QNAP App Center or via SSH: grep -i version /path/to/qsync/configCheck Version:
ssh admin@qnap-nas 'cat /etc/config/qsync_central_version' or check via QNAP web interfaceVerify Fix Applied:
Confirm Qsync Central version is 5.0.0.4 or later in App Center or system logs📡 Detection & Monitoring
Log Indicators:
- Unusual resource consumption patterns
- Multiple failed synchronization attempts
- Abnormal user account activity
Network Indicators:
- Spike in synchronization traffic
- Unusual connection patterns to Qsync Central ports
SIEM Query:
source="qsync_central" AND (resource_usage>90% OR failed_attempts>100)