CVE-2025-9748
📋 TL;DR
A stack-based buffer overflow vulnerability exists in Tenda CH22 router firmware version 1.0.0.1. Remote attackers can exploit this by sending specially crafted requests to the httpd component's /goform/IPSECsave endpoint, potentially leading to arbitrary code execution. This affects all users running the vulnerable firmware on Tenda CH22 routers.
💻 Affected Systems
- Tenda CH22
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote unauthenticated attacker gains full control of the router, enabling traffic interception, network pivoting, or persistent backdoor installation.
Likely Case
Router crashes or becomes unstable, causing denial of service and network disruption.
If Mitigated
If isolated from untrusted networks, impact limited to internal attackers with network access.
🎯 Exploit Status
Public GitHub repository contains exploit details; remote exploitation requires no authentication.
🛠️ 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 administration
allPrevent external access to router management interface
Block access to /goform/IPSECsave
linuxUse firewall rules to block requests to vulnerable endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/goform/IPSECsave" --algo bm -j DROP
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict access controls
- Implement network segmentation to limit potential lateral movement
🔍 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 firmwareVerify Fix Applied:
Verify firmware version has changed from 1.0.0.1 to a newer version after update.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /goform/IPSECsave with unusual parameter values
- Router crash/reboot logs
- Unusual process execution
Network Indicators:
- HTTP POST requests to router IP on port 80/tcp with ipsecno parameter
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (url="/goform/IPSECsave" OR message="crash" OR message="reboot")