CVE-2025-15216
📋 TL;DR
A stack-based buffer overflow vulnerability in Tenda AC23 routers allows remote attackers to execute arbitrary code by manipulating the bindnum parameter in the SetIpMacBind function. This affects Tenda AC23 routers running firmware version 16.03.07.52. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda AC23
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, enabling attackers to intercept network traffic, install malware, pivot to internal networks, or create persistent backdoors.
Likely Case
Remote code execution resulting in device takeover, allowing attackers to modify router settings, intercept traffic, or use the device as part of a botnet.
If Mitigated
Denial of service if exploit fails or is blocked by network controls, but device remains vulnerable to skilled attackers.
🎯 Exploit Status
Public exploit details are available, making this easily weaponizable. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ 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. Download the latest firmware for AC23. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to the router's web interface
Network segmentation
allIsolate AC23 routers from critical networks
🧯 If You Can't Patch
- Replace affected routers with different models or brands
- Implement strict network access controls to limit traffic to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface: System Status > Firmware Version. If version is 16.03.07.52, device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
After firmware update, verify version is no longer 16.03.07.52. Test SetIpMacBind functionality with malformed bindnum values.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/SetIpMacBind with abnormal bindnum values
- Router crash/reboot logs
Network Indicators:
- Unusual traffic patterns to router management interface
- Exploit payloads in HTTP POST data
SIEM Query:
source="router_logs" AND (uri="/goform/SetIpMacBind" AND (bindnum>100 OR bindnum<0))