CVE-2026-2139
📋 TL;DR
A buffer overflow vulnerability in Tenda TX9 routers allows remote attackers to execute arbitrary code by manipulating the ssid parameter in the fast_setting_wifi_set function. This affects Tenda TX9 routers up to firmware version 22.03.02.10_multi. The vulnerability is remotely exploitable and has public proof-of-concept code available.
💻 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, network infiltration, and potential lateral movement to connected systems.
Likely Case
Remote code execution allowing attackers to install malware, create backdoors, or disrupt network services.
If Mitigated
Denial of service or limited information disclosure if exploit fails to achieve full code execution.
🎯 Exploit Status
Proof-of-concept code is publicly available on GitHub, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda official website for firmware updates
2. Download latest firmware for TX9 model
3. Access router admin interface
4. Navigate to firmware upgrade section
5. Upload and apply new firmware
6. Reboot router after update
🔧 Temporary Workarounds
Disable remote administration
allPrevents external attackers from accessing vulnerable interface
Network segmentation
allIsolate TX9 routers from critical network segments
🧯 If You Can't Patch
- Replace affected Tenda TX9 routers with different models or brands
- Implement strict network access controls to limit exposure of vulnerable routers
🔍 How to Verify
Check if Vulnerable:
Access router admin interface, navigate to firmware version page, check if version is 22.03.02.10_multi or earlierCheck Version:
curl -s http://router-ip/goform/getStatus | grep firmware_versionVerify Fix Applied:
After firmware update, verify version is newer than 22.03.02.10_multi📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/fast_setting_wifi_set with long ssid parameters
- Router crash/reboot logs
Network Indicators:
- Unusual traffic patterns from router IP
- Outbound connections from router to unknown destinations
SIEM Query:
source="router_logs" AND uri="/goform/fast_setting_wifi_set" AND content_length>100