CVE-2026-2186
📋 TL;DR
This vulnerability in Tenda RX3 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the fromSetIpMacBind function. Attackers can exploit this without authentication to potentially take full control of affected devices. Users of Tenda RX3 routers with vulnerable firmware are at risk.
💻 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
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access, though internal network attacks remain possible.
🎯 Exploit Status
Public exploit code exists and remote exploitation requires no authentication, making this easily weaponizable.
🛠️ 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. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router administration interface
Network segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected devices with patched or different models
- Implement strict network access controls to limit exposure to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Upgrade sectionCheck Version:
Check via router web interface or SSH if enabled: cat /proc/version or show version commandsVerify Fix Applied:
Verify firmware version is no longer 16.03.13.11 after update📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetIpMacBind
- Multiple failed buffer overflow attempts
- Unexpected router reboots or configuration changes
Network Indicators:
- Unusual traffic patterns to router management interface
- Suspicious payloads in HTTP requests to router
SIEM Query:
source="router_logs" AND (uri="/goform/SetIpMacBind" OR message="buffer overflow" OR message="segmentation fault")