CVE-2025-22949
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on Tenda AC9 routers by injecting malicious commands into the SetSambaCfg form. Attackers can gain full control of affected devices, potentially compromising network security. All users running the vulnerable firmware version are affected.
💻 Affected Systems
- Tenda AC9
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and botnet recruitment.
Likely Case
Router compromise allowing attackers to modify DNS settings, intercept credentials, deploy malware to connected devices, and use the router for DDoS attacks.
If Mitigated
Limited impact with proper network segmentation, firewall rules blocking external access to router admin interface, and regular monitoring.
🎯 Exploit Status
The vulnerability is in a web form handler that doesn't properly sanitize user input before passing it to system commands. Public technical details exist, making exploitation straightforward for attackers.
🛠️ 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 for AC9 v1.0. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable Samba Service
allDisable the vulnerable Samba configuration interface to prevent exploitation
Login to router admin interface
Navigate to Advanced > USB Sharing
Disable Samba sharing if enabled
Restrict Admin Interface Access
linuxBlock external access to router admin interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -s ! 192.168.1.0/24 -j DROP
iptables -A INPUT -p tcp --dport 443 -s ! 192.168.1.0/24 -j DROP
🧯 If You Can't Patch
- Replace the router with a different model that receives security updates
- Place the router behind a dedicated firewall that blocks all external access to its management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or System Tools > Firmware Upgrade. If version is exactly 15.03.05.19 for AC9 v1.0, the device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep version or check web interfaceVerify Fix Applied:
After updating firmware, verify the version has changed from 15.03.05.19. Test if the /goform/SetSambaCfg endpoint still accepts command injection.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetSambaCfg
- Commands with shell metacharacters in web logs
- Unexpected system processes spawned from web server
Network Indicators:
- HTTP POST requests to /goform/SetSambaCfg containing pipe characters, semicolons, or backticks
- Outbound connections from router to suspicious IPs
SIEM Query:
source="router-logs" AND uri_path="/goform/SetSambaCfg" AND (request_body="*;*" OR request_body="*|*" OR request_body="*`*")