CVE-2025-50258
📋 TL;DR
A buffer overflow vulnerability in Tenda AC6 routers allows remote attackers to execute arbitrary code by sending specially crafted requests to the SetSysTimeCfg function. This affects Tenda AC6 routers running firmware version 15.03.05.16_multi. Attackers can potentially gain full control of affected devices.
💻 Affected Systems
- Tenda AC6
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to internal networks, and persistent backdoor installation.
Likely Case
Device takeover allowing network traffic interception, DNS manipulation, and credential harvesting from connected devices.
If Mitigated
Limited to denial of service if exploit fails or device crashes without code execution.
🎯 Exploit Status
Public proof-of-concept available on GitHub. Exploitation requires sending crafted HTTP request to vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware for AC6 model. 3. Log into router admin 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
Log into router admin > System Tools > Remote Management > Disable
Network Segmentation
allIsolate router management interface to trusted network
Configure firewall rules to restrict access to router IP on ports 80/443
🧯 If You Can't Patch
- Replace vulnerable 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 admin interface under System Status or System Tools > Firmware UpgradeCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is newer than 15.03.05.16_multi📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/SetSysTimeCfg
- Large time parameter values in requests
- Router crash/reboot logs
Network Indicators:
- HTTP requests with abnormally long time parameter to router management interface
- Traffic patterns suggesting exploit attempts
SIEM Query:
source="router_logs" AND (uri="/goform/SetSysTimeCfg" OR "time=" AND length>100)