CVE-2025-15460
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on UTT 进取 520W routers by exploiting a buffer overflow in the strcpy function when manipulating the EncryptionMode parameter. Attackers can take full control of affected devices without authentication. All users of UTT 进取 520W version 1.7.7-180627 are affected.
💻 Affected Systems
- UTT 进取 520W
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to persistent backdoor installation, credential theft, network pivoting, and device bricking.
Likely Case
Remote code execution allowing attackers to install malware, create botnet nodes, or intercept network traffic.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Proof of concept is publicly available on GitHub. The vulnerability requires sending a specially crafted HTTP request to the web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available - vendor did not respond to disclosure
Restart Required: Yes
Instructions:
No official patch available. Consider replacing affected devices with supported alternatives or implementing strict network controls.
🔧 Temporary Workarounds
Disable PPTP Client Service
allDisable the vulnerable PPTP client configuration function if not required
Access router web interface > VPN > PPTP Client > Disable
Restrict Web Interface Access
linuxLimit access to the router's web management interface to trusted IPs only
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Isolate affected routers in a dedicated VLAN with strict firewall rules preventing inbound internet access
- Implement network-based intrusion detection to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: System Status > Firmware Version. If version is 1.7.7-180627, device is vulnerable.Check Version:
curl -s http://router-ip/status.cgi | grep firmware_versionVerify Fix Applied:
No official fix available. Verify workarounds by testing that PPTP client is disabled and web interface access is restricted.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formPptpClientConfig
- Multiple failed buffer overflow attempts in system logs
- Unexpected process execution or service restarts
Network Indicators:
- HTTP POST requests to router IP on port 80/443 with malformed EncryptionMode parameter
- Unusual outbound connections from router to unknown IPs
SIEM Query:
source="router_logs" AND (uri="/goform/formPptpClientConfig" OR message="buffer overflow" OR message="segmentation fault")