CVE-2026-2138
📋 TL;DR
A buffer overflow vulnerability in Tenda TX9 routers allows remote attackers to execute arbitrary code by manipulating the list argument in the SetStaticRouteCfg function. This affects Tenda TX9 routers up to firmware version 22.03.02.10_multi. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda TX9
⚠️ 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, data theft, botnet enrollment, or network pivot attacks.
Likely Case
Remote code execution allowing attackers to install malware, modify configurations, or disrupt network services.
If Mitigated
Denial of service or temporary disruption if exploit attempts are blocked but not patched.
🎯 Exploit Status
Proof of concept exploit code is publicly available, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. If update available, download and install via router web interface. 3. Reboot router after installation.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router administration interface
Access router web interface > Advanced > System Tools > Remote Management > Disable
Network segmentation
allIsolate router management interface from untrusted networks
Configure firewall rules to restrict access to router IP on ports 80/443
🧯 If You Can't Patch
- Replace affected routers with different models or brands
- Implement strict network access controls to limit exposure
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: Login > Advanced > System Tools > Firmware UpgradeCheck Version:
Not applicable - check via web interfaceVerify Fix Applied:
Verify firmware version is newer than 22.03.02.10_multi📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetStaticRouteCfg
- Large payloads in router logs
- Multiple failed exploit attempts
Network Indicators:
- Unusual traffic patterns to router management interface
- Exploit payload patterns in network traffic
SIEM Query:
source="router_logs" AND uri="/goform/SetStaticRouteCfg" AND (payload_size>1000 OR contains(list, "overflow"))