CVE-2025-45797
📋 TL;DR
This CVE describes a critical buffer overflow vulnerability in TOTOlink A950RG routers. Attackers can exploit it by sending specially crafted requests to the setNoticeCfg interface, potentially allowing remote code execution. All users running the vulnerable firmware version are affected.
💻 Affected Systems
- TOTOlink A950RG
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, and lateral movement to other devices on the network.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as part of a botnet.
If Mitigated
Limited impact if the device is behind a firewall with strict inbound filtering and the vulnerable interface is not exposed.
🎯 Exploit Status
The GitHub reference contains detailed analysis and likely exploit code. The low complexity and unauthenticated nature make this highly exploitable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch is currently available. Monitor TOTOlink's official website for firmware updates addressing CVE-2025-45797.
🔧 Temporary Workarounds
Network Segmentation and Access Control
linuxIsolate the router from untrusted networks and restrict access to the management interface.
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
Disable Remote Management
allTurn off remote management features if not required.
🧯 If You Can't Patch
- Replace the device with a different model that receives security updates
- Place the router behind a firewall that blocks all inbound traffic to the management interface
🔍 How to Verify
Check if Vulnerable:
Check the firmware version in the router's web interface under System Status or similar section.Check Version:
curl -s http://router-ip/cgi-bin/luci/ | grep -i versionVerify Fix Applied:
Verify the firmware version has been updated to a version later than V4.1.2cu.5204_B20210112.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /lib/cste_modules/system.so with setNoticeCfg
- Multiple failed attempts to access the management interface
Network Indicators:
- Unusual outbound connections from the router
- Traffic patterns suggesting command and control communication
SIEM Query:
source="router_logs" AND (uri="/lib/cste_modules/system.so" AND method="POST" AND params="setNoticeCfg")