CVE-2025-3328
📋 TL;DR
A critical buffer overflow vulnerability in Tenda AC1206 routers allows remote attackers to execute arbitrary code by manipulating the ssid or timeZone parameters. This affects the form_fast_setting_wifi_set function and can lead to complete device compromise. Attackers can exploit this without authentication from the network.
💻 Affected Systems
- Tenda AC1206
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full router compromise, credential theft, network traffic interception, and pivot to internal network devices.
Likely Case
Router takeover enabling DNS hijacking, credential harvesting, and persistent backdoor installation.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and strong network segmentation.
🎯 Exploit Status
Public exploit code available in GitHub repositories. Attack requires network access to router's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates 2. Download latest firmware 3. Access 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 management interface
Network segmentation
allIsolate router management interface to trusted network segment only
🧯 If You Can't Patch
- Replace affected router with different model/vendor
- Place router behind firewall with strict inbound rules blocking access to management ports
🔍 How to Verify
Check if Vulnerable:
Access router web interface, check firmware version in System Status or About pageCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is newer than 15.03.06.23📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/fast_setting_wifi_set with long ssid/timeZone parameters
- Router crash/reboot logs
Network Indicators:
- Unusual traffic patterns to router management interface
- POST requests with oversized parameter values
SIEM Query:
source="router_logs" AND uri="/goform/fast_setting_wifi_set" AND (param_length(ssid)>100 OR param_length(timeZone)>100)🔗 References
- https://github.com/CH13hh/tmp_store_cc/blob/main/AC1206/AC1206form_fast_setting_wifi_set/form_fast_setting_wifi_set.md
- https://github.com/CH13hh/tmp_store_cc/blob/main/AC1206/AC1206form_fast_setting_wifi_set_time/time.md
- https://vuldb.com/?ctiid.303540
- https://vuldb.com/?id.303540
- https://vuldb.com/?submit.551893
- https://www.tenda.com.cn/
- https://github.com/CH13hh/tmp_store_cc/blob/main/AC1206/AC1206form_fast_setting_wifi_set/form_fast_setting_wifi_set.md
- https://github.com/CH13hh/tmp_store_cc/blob/main/AC1206/AC1206form_fast_setting_wifi_set_time/time.md
