CVE-2025-29137
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda AC7 routers by exploiting a buffer overflow in the timeZone parameter. Attackers can gain full control of affected devices, potentially compromising network security. Users with Tenda AC7 routers running vulnerable firmware are affected.
💻 Affected Systems
- Tenda AC7
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise leading to network takeover, credential theft, malware deployment, and persistent backdoor installation.
Likely Case
Router compromise allowing traffic interception, DNS hijacking, and lateral movement to connected devices.
If Mitigated
Limited impact if isolated from critical networks, with only router functionality disruption.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repository; buffer overflow exploitation is well-understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware. 3. Access router admin panel. 4. Navigate to firmware upgrade section. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router administration interface
Network Segmentation
allIsolate router management interface to trusted network only
🧯 If You Can't Patch
- Replace affected router with different model/brand
- Implement strict firewall rules blocking all external access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin panel under System Status or Firmware Upgrade sectionCheck Version:
Login to router admin panel and check firmware version in system settingsVerify Fix Applied:
Verify firmware version has been updated to a version later than V15.03.06.44📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to form_fast_setting_wifi_set endpoint
- Multiple failed login attempts followed by buffer overflow patterns
- Router crash/reboot logs
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Traffic redirection patterns
SIEM Query:
source="router_logs" AND ("form_fast_setting_wifi_set" OR "timeZone" AND length>100)