CVE-2025-7418
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda O3V2 routers allows remote attackers to execute arbitrary code by manipulating the destIP parameter in the fromPingResultGet function. This affects Tenda O3V2 routers running firmware version 1.0.0.12(3880) with the vulnerable httpd component exposed. Attackers can exploit this remotely without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda O3V2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if device is behind strict network segmentation with no internet exposure and proper access controls.
🎯 Exploit Status
Proof of concept code is publicly available on GitHub, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. If update available, download and install following vendor instructions. 3. Reboot router after update. 4. Verify firmware version is no longer 1.0.0.12(3880).
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router's web interface
Access router admin panel → Advanced Settings → Remote Management → Disable
Network Segmentation
allIsolate router management interface from untrusted networks
Configure firewall rules to restrict access to router IP on ports 80/443 to trusted IPs only
🧯 If You Can't Patch
- Replace affected devices with patched or different model routers
- Implement strict network access controls and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface: System Status → Firmware Version. If version is 1.0.0.12(3880), device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep version or check web interfaceVerify Fix Applied:
After update, verify firmware version is different from 1.0.0.12(3880) and test that /goform/setPing endpoint no longer accepts malformed destIP parameters.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /goform/setPing with unusually long destIP parameters
- Multiple failed buffer overflow attempts in system logs
- Unusual process execution from httpd
Network Indicators:
- HTTP POST requests to router IP on port 80/443 with large destIP payloads
- Unusual outbound connections from router after exploitation
SIEM Query:
source="router_logs" AND (url="/goform/setPing" AND destIP.length>100) OR (process="httpd" AND event="buffer_overflow")🔗 References
- https://github.com/wudipjq/my_vuln/blob/main/Tenda3/vuln_51/51.md
- https://github.com/wudipjq/my_vuln/blob/main/Tenda3/vuln_51/51.md#poc
- https://vuldb.com/?ctiid.315878
- https://vuldb.com/?id.315878
- https://vuldb.com/?submit.608864
- https://www.tenda.com.cn/
- https://github.com/wudipjq/my_vuln/blob/main/Tenda3/vuln_51/51.md
- https://github.com/wudipjq/my_vuln/blob/main/Tenda3/vuln_51/51.md#poc
