CVE-2025-26004
📋 TL;DR
The Telesquare TLR-2005KSH router firmware version 1.1.4 contains a stack buffer overflow vulnerability in the admin.cgi endpoint when processing the setDdns parameter. This allows remote attackers to execute arbitrary code with administrative privileges. Organizations using this specific router model and firmware version are affected.
💻 Affected Systems
- Telesquare TLR-2005KSH
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network pivoting, credential theft, and persistent backdoor installation.
Likely Case
Router takeover allowing traffic interception, DNS manipulation, and network reconnaissance.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public GitHub repository contains proof-of-concept exploit code. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch available. Monitor Telesquare website for firmware updates. Consider replacing affected hardware if no fix is forthcoming.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict access to router web interface using firewall rules
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
Disable Remote Administration
allTurn off remote management features in router settings
🧯 If You Can't Patch
- Isolate affected routers in dedicated VLAN with strict firewall rules
- Implement network monitoring for unusual traffic patterns to/from router
🔍 How to Verify
Check if Vulnerable:
Check router web interface for firmware version 1.1.4. Attempt to access /admin.cgi?setDdns= with overflow payload (not recommended in production).Check Version:
curl -s http://router-ip/status.cgi | grep -i versionVerify Fix Applied:
Check if firmware version has been updated beyond 1.1.4. Test if admin.cgi endpoint still accepts malformed setDdns parameters.📡 Detection & Monitoring
Log Indicators:
- Multiple failed requests to admin.cgi
- Unusual POST requests with long parameter values
- Router reboot events
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Traffic redirection patterns
SIEM Query:
source="router_logs" AND (uri="/admin.cgi" AND param="setDdns" AND length(param_value)>1000)