CVE-2025-26008
📋 TL;DR
An unauthenticated stack overflow vulnerability in Telesquare TLR-2005KSH routers allows remote attackers to execute arbitrary code by sending specially crafted requests to the admin.cgi endpoint with the setSyncTimeHost parameter. This affects all users running version 1.1.4 of the firmware. Attackers can gain complete control of affected devices without authentication.
💻 Affected Systems
- Telesquare TLR-2005KSH
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network pivoting, credential theft, and botnet recruitment.
Likely Case
Remote code execution resulting in device takeover, configuration modification, and network surveillance capabilities.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
The GitHub reference contains technical details and proof-of-concept information. Exploitation requires sending a crafted HTTP request to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch is currently available. Monitor Telesquare's website for security updates and firmware releases.
🔧 Temporary Workarounds
Block admin.cgi Access
linuxUse firewall rules to block external access to the admin.cgi endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "admin.cgi" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "admin.cgi" --algo bm -j DROP
Network Segmentation
allIsolate affected devices in separate VLANs with strict access controls
🧯 If You Can't Patch
- Immediately disconnect affected devices from internet-facing interfaces
- Implement strict network access controls limiting communication to/from affected devices
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface at System > Firmware Upgrade or via SSH with 'cat /etc/version'Check Version:
cat /etc/version 2>/dev/null || grep -i version /proc/cpuinfoVerify Fix Applied:
Verify firmware version is updated beyond 1.1.4 when patch becomes available📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing 'admin.cgi' with 'setSyncTimeHost' parameter
- Unusual process execution or system modifications
Network Indicators:
- HTTP POST requests to /admin.cgi with long parameter values
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (uri="*admin.cgi*" AND param="*setSyncTimeHost*")