CVE-2025-15215
📋 TL;DR
A buffer overflow vulnerability in Tenda AC10U routers allows remote attackers to execute arbitrary code by sending specially crafted HTTP POST requests to the /goform/setPptpUserList endpoint. This affects users running vulnerable firmware versions on these routers. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Tenda AC10U
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, and lateral movement to other devices on the network.
Likely Case
Remote code execution allowing attacker to modify router settings, intercept traffic, or use the device as part of a botnet.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access, though internal network attacks remain possible.
🎯 Exploit Status
Public disclosure includes technical details that make weaponization straightforward. The vulnerability requires sending a crafted HTTP POST request.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware for AC10U. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router web interface
Network segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected routers with patched or different models
- Implement strict network access controls to limit access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface at System Status > Firmware Version. If version is 15.03.06.48 or 15.03.06.49, device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
After firmware update, verify version is higher than 15.03.06.49. Test by attempting to access /goform/setPptpUserList endpoint with monitoring for crashes.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /goform/setPptpUserList with unusual payload length
- Router crash/reboot events
- Unusual process creation on router
Network Indicators:
- HTTP traffic to router port 80/443 with POST to /goform/setPptpUserList
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (uri="/goform/setPptpUserList" OR message="buffer overflow" OR message="segmentation fault")