CVE-2025-7416
📋 TL;DR
A critical stack-based buffer overflow vulnerability exists in Tenda O3V2 routers running firmware version 1.0.0.12(3880). Remote attackers can exploit this by sending specially crafted HTTP requests to the /goform/setSysTimeInfo endpoint, potentially allowing arbitrary code execution. This affects all users of vulnerable Tenda O3V2 routers with the affected firmware.
💻 Affected Systems
- Tenda O3V2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote unauthenticated attackers gain full control of the router, enabling them to intercept traffic, modify configurations, install persistent 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 limited to router compromise without lateral movement to other systems.
🎯 Exploit Status
Public proof-of-concept code is available, 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 available, download the latest firmware. 3. Log into 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 by disabling remote management/administration features.
Network Segmentation
allPlace the router in a dedicated network segment with strict firewall rules limiting access to its management interface.
🧯 If You Can't Patch
- Replace the vulnerable router with a different model or from a different vendor
- Implement strict network access controls to limit who can reach the router's management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface. If version is exactly 1.0.0.12(3880), the device is vulnerable.Check Version:
Log into router web interface and check System Status or Firmware Version page.Verify Fix Applied:
After updating firmware, verify the version has changed from 1.0.0.12(3880) to a newer version.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /goform/setSysTimeInfo with unusually long Time parameter values
- Router crash or reboot logs following suspicious HTTP requests
Network Indicators:
- Unusual HTTP traffic to router management interface from external IPs
- POST requests to /goform/setSysTimeInfo with buffer overflow patterns
SIEM Query:
source="router_logs" AND (uri="/goform/setSysTimeInfo" AND content_length>100) OR (event="crash" AND process="httpd")