CVE-2024-41340
📋 TL;DR
This vulnerability in Draytek routers allows attackers to upload malicious APP Enforcement modules, leading to arbitrary code execution with root privileges. It affects multiple Draytek Vigor router models running outdated firmware versions. Organizations using these vulnerable devices are at risk of complete device compromise.
💻 Affected Systems
- Draytek Vigor 165
- Draytek Vigor 166
- Draytek Vigor 2620
- Draytek Vigor LTE200
- Draytek Vigor 2860
- Draytek Vigor 2925
- Draytek Vigor 2862
- Draytek Vigor 2926
- Draytek Vigor 2133
- Draytek Vigor 2762
- Draytek Vigor 2832
- Draytek Vigor 2135
- Draytek Vigor 2765
- Draytek Vigor 2766
- Draytek Vigor 2865
- Draytek Vigor 2866
- Draytek Vigor 2927
- Draytek Vigor 2962
- Draytek Vigor 3910
- Draytek Vigor 3912
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attackers to intercept all network traffic, pivot to internal networks, install persistent backdoors, and disrupt network operations.
Likely Case
Router takeover enabling traffic monitoring, credential theft, and use as a foothold for further attacks on the internal network.
If Mitigated
Limited impact if proper network segmentation and access controls prevent exploitation attempts.
🎯 Exploit Status
Exploitation requires authentication to the router's management interface. Public technical details and proof-of-concept are available in the referenced Medium article.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Varies by model - see CVE description for specific fixed versions
Vendor Advisory: http://draytek.com
Restart Required: Yes
Instructions:
1. Identify your Draytek router model. 2. Visit Draytek's support website. 3. Download the appropriate firmware version that fixes this vulnerability. 4. Backup current configuration. 5. Upload and install the new firmware via the web interface. 6. Reboot the router. 7. Verify the firmware version is updated.
🔧 Temporary Workarounds
Restrict Management Interface Access
allLimit access to the router's web management interface to trusted IP addresses only
Disable Remote Management
allTurn off WAN-side access to the management interface if not required
🧯 If You Can't Patch
- Segment vulnerable routers into isolated network zones
- Implement strict firewall rules to limit router management interface access
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: System Maintenance > Firmware InformationCheck Version:
No CLI command - use web interface at System Maintenance > Firmware InformationVerify Fix Applied:
Verify firmware version matches or exceeds the patched version for your specific model📡 Detection & Monitoring
Log Indicators:
- Unusual APP Enforcement module uploads
- Multiple failed authentication attempts followed by successful login
- Firmware modification logs
Network Indicators:
- Unexpected outbound connections from router
- Traffic patterns suggesting router compromise
SIEM Query:
source="draytek-router" AND (event="module_upload" OR event="firmware_change")