CVE-2025-4810
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda AC7 routers allows remote attackers to execute arbitrary code by manipulating the reboot_time parameter in the formSetRebootTimer function. This affects Tenda AC7 routers running firmware version 15.03.06.44. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda AC7
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, network traffic interception, and lateral movement to other network devices.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as part of a botnet.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access, though internal network attacks remain possible.
🎯 Exploit Status
Exploit details have been publicly disclosed. The vulnerability requires sending a specially crafted HTTP request to the vulnerable endpoint.
🛠️ 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 for AC7 model. 3. Access router web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router management interface
Network segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Replace affected router with different model/brand
- Place router behind dedicated firewall with strict access controls
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under System Status or System Tools > Firmware UpgradeCheck Version:
Check via router web interface or SSH if enabled: cat /proc/version or show version commandsVerify Fix Applied:
Verify firmware version is newer than 15.03.06.44 after update📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/SetRebootTimer
- Multiple failed buffer overflow attempts in system logs
- Unexpected router reboots or configuration changes
Network Indicators:
- HTTP traffic to router IP on port 80/443 with abnormal reboot_time parameter length
- Exploit pattern matching in network traffic
SIEM Query:
source="router_logs" AND (uri="/goform/SetRebootTimer" OR message="buffer overflow" OR message="reboot_time")