CVE-2025-7423
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda O3V2 routers allows remote attackers to execute arbitrary code by sending specially crafted requests to the httpd component. This affects the formWifiMacFilterSet function when manipulating the macList argument. 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
Remote code execution leading to complete device compromise, lateral movement to internal networks, persistent backdoor installation, and data exfiltration.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept network traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Proof of concept exploit code is publicly available on GitHub, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None found in provided references
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download the latest firmware for O3V2. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's web interface
Network Segmentation
allIsolate affected routers from critical network segments
🧯 If You Can't Patch
- Replace affected devices with patched or different vendor equipment
- Implement strict network access controls to limit traffic to affected routers
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface (typically at 192.168.0.1 or 192.168.1.1) and compare with affected version 1.0.0.12(3880).Check Version:
curl -s http://router-ip/goform/getStatus | grep version or check web interface System Status pageVerify Fix Applied:
Verify firmware version has been updated to a version later than 1.0.0.12(3880) or check vendor advisory for fixed versions.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/setWrlFilterList
- Multiple failed buffer overflow attempts in system logs
- Unexpected process crashes or restarts of httpd service
Network Indicators:
- Unusual outbound connections from router to external IPs
- Suspicious HTTP traffic patterns to router management interface
SIEM Query:
source="router_logs" AND (uri="/goform/setWrlFilterList" OR process="httpd" AND event="crash")🔗 References
- https://github.com/wudipjq/my_vuln/blob/main/Tenda3/vuln_56/56.md
- https://github.com/wudipjq/my_vuln/blob/main/Tenda3/vuln_56/56.md#poc
- https://vuldb.com/?ctiid.315883
- https://vuldb.com/?id.315883
- https://vuldb.com/?submit.608869
- https://www.tenda.com.cn/
- https://github.com/wudipjq/my_vuln/blob/main/Tenda3/vuln_56/56.md
