CVE-2025-10547
📋 TL;DR
An uninitialized variable vulnerability in DrayOS HTTP CGI request processing allows remote attackers to execute arbitrary code on Vigor Routers through memory corruption. This affects all Vigor Routers running vulnerable DrayOS versions. Attackers can gain full control of affected devices.
💻 Affected Systems
- Vigor Routers running DrayOS
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router with persistent backdoor installation, credential theft, network traffic interception, and lateral movement to internal networks.
Likely Case
Router takeover leading to network disruption, DNS hijacking, credential harvesting, and deployment of malware to connected devices.
If Mitigated
Limited impact if routers are behind firewalls with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Memory corruption vulnerabilities in network appliances are frequently weaponized. No public PoC yet but technical details are available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Draytek security advisory for specific firmware versions
Vendor Advisory: https://www.draytek.com/about/security-advisory/use-of-uninitialized-variable-vulnerabilities/
Restart Required: Yes
Instructions:
1. Access router web interface. 2. Navigate to System Maintenance > Firmware Upgrade. 3. Download latest firmware from Draytek support portal. 4. Upload and apply firmware update. 5. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allDisable HTTP/HTTPS management access from WAN interfaces
Restrict Management Access
allConfigure firewall rules to allow management only from trusted IP addresses
🧯 If You Can't Patch
- Segment network to isolate routers from critical assets
- Implement strict inbound firewall rules blocking all unnecessary ports to router WAN interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version against Draytek security advisory. If running vulnerable DrayOS version, device is affected.Check Version:
Login to router web interface and check System Information > Firmware VersionVerify Fix Applied:
Verify firmware version has been updated to patched version specified in Draytek advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to CGI endpoints
- Multiple failed login attempts followed by successful exploitation
- Unexpected process execution in system logs
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Traffic patterns indicating command and control
SIEM Query:
source="router_logs" AND (uri="*.cgi" OR uri="*.pl") AND status=200 AND user_agent="*exploit*"