CVE-2025-12273
📋 TL;DR
CVE-2025-12273 is a buffer overflow vulnerability in Tenda CH22 routers affecting version 1.0.0.1. Attackers can remotely exploit this by manipulating the 'page' parameter in the webExcptypemanFilter function, potentially leading to arbitrary code execution. This affects all users running the vulnerable firmware version.
💻 Affected Systems
- Tenda CH22
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attackers could execute arbitrary code with root privileges, gaining complete control of the router to intercept traffic, deploy malware, or pivot to internal networks.
Likely Case
Remote code execution leading to router compromise, enabling traffic interception, DNS hijacking, or botnet recruitment.
If Mitigated
If properly segmented and firewalled, impact could be limited to the router itself without lateral movement to other systems.
🎯 Exploit Status
Public exploit available on GitHub. Attack requires network access to router's web interface (typically port 80/443).
🛠️ 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. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router's web interface
Access router admin > Advanced > Remote Management > Disable
Network Segmentation
linuxIsolate router management interface to trusted network
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_NET -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_NET -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Replace affected router with different model/vendor
- Implement strict network access controls to limit exposure to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 1.0.0.1, device is vulnerable.Check Version:
curl -s http://router-ip/ | grep -i 'firmware' or check admin interface System Status pageVerify Fix Applied:
Verify firmware version has changed from 1.0.0.1 to a newer version.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/webExcptypemanFilter
- Multiple failed buffer overflow attempts
- Unexpected router reboots or configuration changes
Network Indicators:
- Unusual traffic patterns from router
- DNS queries to malicious domains from router
- Outbound connections from router to suspicious IPs
SIEM Query:
source="router_logs" AND (uri="/goform/webExcptypemanFilter" OR message="buffer overflow")