CVE-2026-1687
📋 TL;DR
This CVE describes a command injection vulnerability in Tenda HG10 routers through the Boa webserver's formSamba endpoint. Attackers can remotely execute arbitrary commands by manipulating the serverString parameter. Users of affected Tenda HG10 routers with exposed web interfaces are at risk.
💻 Affected Systems
- Tenda HG10
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing persistent backdoor installation, credential theft, network pivoting, and participation in botnets.
Likely Case
Router takeover leading to DNS hijacking, credential harvesting, and lateral movement to connected devices.
If Mitigated
Limited impact if router web interface is not internet-facing and network segmentation prevents lateral movement.
🎯 Exploit Status
Public proof-of-concept available on GitHub demonstrates command injection via serverString parameter manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
Check Tenda website for firmware updates. If available, download latest firmware and apply through router admin interface.
🔧 Temporary Workarounds
Disable Boa webserver
linuxDisable the vulnerable Boa webserver component if not required
Requires firmware modification - not recommended for typical users
Block external access
allEnsure router admin interface is not accessible from the internet
Check router firewall/WAN settings to block port 80/443 from external sources
🧯 If You Can't Patch
- Isolate affected routers in separate network segment with strict firewall rules
- Implement network monitoring for unusual outbound connections from router IP
🔍 How to Verify
Check if Vulnerable:
Check router firmware version matches affected version. Test with controlled exploit if in lab environment.Check Version:
Login to router admin interface and check firmware version in system settingsVerify Fix Applied:
Verify firmware version has been updated to non-vulnerable version. Test formSamba endpoint is no longer accessible or vulnerable.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /boaform/formSamba
- Commands with shell metacharacters in serverString parameter
- Unexpected process execution from webserver context
Network Indicators:
- Unusual outbound connections from router IP
- Traffic to known malicious IPs from router
- DNS queries to suspicious domains
SIEM Query:
source="router_logs" AND (uri="/boaform/formSamba" OR uri CONTAINS "formSamba") AND (param="serverString" OR param CONTAINS "serverString")🔗 References
- https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/Tenda/HG10/formSamba-serverString-command.md
- https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/Tenda/HG10/formSamba-serverString-command.md#poc
- https://vuldb.com/?ctiid.343481
- https://vuldb.com/?id.343481
- https://vuldb.com/?submit.741281
- https://www.tenda.com.cn/
