CVE-2025-28361
📋 TL;DR
A buffer overflow vulnerability in Telesquare TLR-2005KSH routers allows remote attackers to read sensitive information from memory via the systemutil.cgi component. This affects organizations using Telesquare TLR-2005KSH routers version 1.1.4, potentially exposing credentials, configuration data, or other sensitive information.
💻 Affected Systems
- Telesquare TLR-2005KSH
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker gains full system access, extracts all configuration data including admin credentials, and pivots to internal networks.
Likely Case
Remote attacker reads sensitive memory contents including partial credentials, session tokens, or configuration details.
If Mitigated
Information disclosure limited to non-sensitive memory regions with proper network segmentation and access controls.
🎯 Exploit Status
Exploitation requires understanding of buffer overflow techniques and memory layout.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after v1.1.4
Vendor Advisory: Not provided in references
Restart Required: No
Instructions:
1. Contact Telesquare for updated firmware. 2. Download latest firmware from vendor portal. 3. Upload firmware via web interface. 4. Apply update and verify version.
🔧 Temporary Workarounds
Disable web management interface
allPrevent remote access to vulnerable component by disabling web interface
Access router CLI via SSH/Telnet
Disable web interface service
Verify service is stopped
Network segmentation
allRestrict access to router management interface using firewall rules
Configure firewall to allow only trusted IPs to port 80/443
Implement VLAN segmentation
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Monitor for unusual access patterns to systemutil.cgi endpoint
🔍 How to Verify
Check if Vulnerable:
Check router web interface version at /cgi-bin/systemutil.cgi or admin panelCheck Version:
curl -k https://[router-ip]/cgi-bin/systemutil.cgi?action=versionVerify Fix Applied:
Verify firmware version is updated beyond v1.1.4 in admin interface📡 Detection & Monitoring
Log Indicators:
- Multiple requests to /cgi-bin/systemutil.cgi with large payloads
- Memory error messages in system logs
Network Indicators:
- Unusual traffic patterns to router management interface
- Large POST requests to systemutil.cgi endpoint
SIEM Query:
source="router_logs" AND uri="/cgi-bin/systemutil.cgi" AND size>1000