CVE-2025-5629
📋 TL;DR
A critical buffer overflow vulnerability in Tenda AC10 routers allows remote attackers to execute arbitrary code by sending specially crafted HTTP requests to the formSetPPTPServer function. This affects all Tenda AC10 routers running firmware version 15.03.06.47 or earlier. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda AC10
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, enabling attackers to install malware, pivot to internal networks, or create persistent backdoors.
Likely Case
Remote code execution resulting in device takeover, network traffic interception, or participation in botnets.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering or if vulnerable interfaces are not exposed.
🎯 Exploit Status
Exploit details are publicly available on GitHub, making this easily weaponizable by attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. If an update is available, download the latest firmware for AC10. 3. Log into router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable PPTP Server
allDisable the vulnerable PPTP server feature if not needed.
Network Segmentation
allIsolate affected routers in separate network segments with strict firewall rules.
🧯 If You Can't Patch
- Block inbound HTTP/HTTPS access to router admin interface from untrusted networks
- Implement network monitoring for unusual HTTP requests to /goform/SetPptpServerCfg
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface; if version is 15.03.06.47 or earlier, device is vulnerable.Check Version:
Log into router web interface and check System Status or Firmware Upgrade sectionVerify Fix Applied:
After updating, verify firmware version is higher than 15.03.06.47 in admin interface.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/SetPptpServerCfg
- Multiple failed buffer overflow attempts in system logs
Network Indicators:
- HTTP traffic to router IP on port 80/443 containing startIp/endIp parameters with long strings
SIEM Query:
source="router_logs" AND (url="/goform/SetPptpServerCfg" OR message="buffer overflow")