CVE-2025-22946
📋 TL;DR
This CVE describes a stack overflow vulnerability in Tenda AC9 v1.0 routers that allows remote attackers to execute arbitrary code by sending specially crafted requests to the /goform/SetOnlineDevName endpoint. The vulnerability affects users running firmware version 15.03.05.19 on these routers, potentially giving attackers full control of the device.
💻 Affected Systems
- Tenda AC9 v1.0 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote unauthenticated attacker gains complete control of the router, enabling traffic interception, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Attacker executes arbitrary code with router privileges, potentially modifying DNS settings, intercepting traffic, or using the router as a foothold into the internal network.
If Mitigated
With proper network segmentation and firewall rules, impact is limited to the router itself without lateral movement into the broader network.
🎯 Exploit Status
The vulnerability is in a sprintf function with improper bounds checking, making exploitation relatively straightforward for attackers with basic reverse engineering 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
Block vulnerable endpoint
linuxUse firewall rules to block access to /goform/SetOnlineDevName
iptables -A INPUT -p tcp --dport 80 -m string --string "/goform/SetOnlineDevName" --algo bm -j DROP
🧯 If You Can't Patch
- Replace the vulnerable router with a different model that receives security updates
- Segment the router on an isolated network VLAN to limit potential damage
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at 192.168.0.1 or 192.168.1.1, navigate to System Status or About pageCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is no longer 15.03.05.19 after update📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/SetOnlineDevName with long parameter values
- Router reboot events following suspicious requests
Network Indicators:
- Unusual outbound connections from router IP
- DNS queries to suspicious domains from router
SIEM Query:
source="router.log" AND (uri="/goform/SetOnlineDevName" AND content_length>1000)