CVE-2025-11837
📋 TL;DR
This critical vulnerability in Malware Remover allows remote attackers to bypass security protections through improper code generation control. Attackers can exploit this to disable or circumvent malware detection mechanisms. All systems running vulnerable versions of Malware Remover are affected.
💻 Affected Systems
- QNAP Malware Remover
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of security protection allowing malware execution, privilege escalation, and system takeover
Likely Case
Malware bypassing detection and removal, leading to data theft, ransomware deployment, or persistence mechanisms
If Mitigated
Limited impact with proper network segmentation and additional security controls in place
🎯 Exploit Status
CVSS 9.8 indicates critical severity with low attack complexity and no authentication required
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Malware Remover 6.6.8.20251023 and later
Vendor Advisory: https://www.qnap.com/en/security-advisory/qsa-25-47
Restart Required: Yes
Instructions:
1. Log into QNAP NAS admin interface
2. Go to App Center
3. Check for updates to Malware Remover
4. Update to version 6.6.8.20251023 or later
5. Restart the NAS device
🔧 Temporary Workarounds
Disable Malware Remover
allTemporarily disable the vulnerable component until patching is possible
Navigate to App Center > Malware Remover > Disable
Network Isolation
allRestrict network access to QNAP NAS devices
Configure firewall rules to limit inbound connections to NAS
🧯 If You Can't Patch
- Isolate affected systems from internet and critical internal networks
- Implement additional endpoint protection and monitoring on affected devices
🔍 How to Verify
Check if Vulnerable:
Check Malware Remover version in QNAP App CenterCheck Version:
Check via QNAP web interface: App Center > Installed Apps > Malware RemoverVerify Fix Applied:
Confirm Malware Remover version is 6.6.8.20251023 or later in App Center📡 Detection & Monitoring
Log Indicators:
- Unexpected Malware Remover service restarts
- Failed malware scan attempts
- Security bypass events in system logs
Network Indicators:
- Unusual outbound connections from NAS devices
- Traffic patterns bypassing security controls
SIEM Query:
source="qnap_nas" AND (event="malware_remover_failure" OR event="security_bypass")