CVE-2025-26010
📋 TL;DR
CVE-2025-26010 allows unauthenticated attackers to modify administrator passwords on Telesquare TLR-2005KSH routers by exploiting the admin.cgi parameter. This affects all users running vulnerable firmware versions, potentially granting full device control. The vulnerability stems from improper access control in the web interface.
💻 Affected Systems
- Telesquare TLR-2005KSH
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover, network compromise, credential theft, and persistent backdoor installation leading to data exfiltration or ransomware deployment.
Likely Case
Unauthorized password change enabling administrative access, allowing configuration changes, network traffic interception, and lateral movement.
If Mitigated
Limited impact if device is behind strict network segmentation with no internet exposure and strong authentication controls.
🎯 Exploit Status
Exploit involves simple HTTP request to admin.cgi with setUserNamePassword parameter; trivial to automate.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
1. Monitor Telesquare for security advisory. 2. Apply firmware update when available. 3. Verify fix by testing exploit after update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate router management interface from untrusted networks
Access Control Lists
linuxRestrict access to router web interface to trusted IP addresses only
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Replace vulnerable device with supported hardware
- Implement strict network monitoring and anomaly detection for management interface traffic
🔍 How to Verify
Check if Vulnerable:
Send HTTP POST request to /admin.cgi with setUserNamePassword parameter and observe if password changes without authenticationCheck Version:
Check web interface login page or system information page for firmware versionVerify Fix Applied:
Attempt same exploit after applying mitigation; successful authentication should now be required📡 Detection & Monitoring
Log Indicators:
- Unauthorized POST requests to /admin.cgi
- Password change events without prior authentication logs
- Multiple failed login attempts followed by successful password reset
Network Indicators:
- HTTP POST to /admin.cgi with setUserNamePassword parameter from unexpected sources
- Unusual management interface traffic patterns
SIEM Query:
source="router_logs" AND uri="/admin.cgi" AND method="POST" AND params CONTAINS "setUserNamePassword"