CVE-2026-2185
📋 TL;DR
A stack-based buffer overflow vulnerability in Tenda RX3 routers allows remote attackers to execute arbitrary code by manipulating device name parameters in MAC filtering configuration. This affects Tenda RX3 routers running firmware version 16.03.13.11. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda RX3
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral network movement, data exfiltration, and persistent backdoor installation.
Likely Case
Router takeover enabling traffic interception, DNS manipulation, credential theft, and use as attack platform.
If Mitigated
Limited impact if isolated from critical networks, with only device reboot or configuration loss.
🎯 Exploit Status
Exploit code is publicly available and requires minimal technical skill to execute.
🛠️ 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 3. Upload via router admin interface 4. Reboot router
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router administration interface
Login to router admin > Advanced > System > Disable 'Remote Management'
Disable MAC filtering
allRemove vulnerable functionality by disabling MAC address filtering
Login to router admin > Advanced > Wireless > MAC Filter > Disable
🧯 If You Can't Patch
- Segment affected routers in isolated VLAN with strict firewall rules
- Implement network monitoring for exploitation attempts and block malicious IPs
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or About pageCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is newer than 16.03.13.11 and test MAC filtering functionality📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/setBlackRule
- Router crash/reboot logs
- Failed authentication attempts to admin interface
Network Indicators:
- HTTP requests with long device names to router admin interface
- Unusual outbound connections from router
SIEM Query:
source="router.log" AND (uri="/goform/setBlackRule" OR "devName" OR "mac") AND data_length>100