CVE-2025-61044
📋 TL;DR
This CVE describes a command injection vulnerability in TOTOLINK X18 routers that allows attackers to execute arbitrary commands on the device. The vulnerability exists in the setEasyMeshAgentCfg function via the agentName parameter. This affects users running vulnerable firmware versions of TOTOLINK X18 routers.
💻 Affected Systems
- TOTOLINK X18
📦 What is this software?
X18 Firmware by Totolink
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing full remote code execution, persistent backdoor installation, network pivoting to internal systems, and data exfiltration.
Likely Case
Router takeover enabling DNS hijacking, traffic interception, credential theft, and botnet recruitment.
If Mitigated
Limited impact with proper network segmentation, firewall rules blocking management interfaces, and regular firmware updates.
🎯 Exploit Status
Proof of concept available on GitHub. Exploitation requires access to the vulnerable endpoint, which may require authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check TOTOLINK website for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload new firmware file. 6. Wait for reboot and verify version.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Access router admin panel -> System -> Remote Management -> Disable
Network Segmentation
linuxIsolate router management interface to trusted network
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_NET -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Implement strict firewall rules to block all external access to router management interfaces (ports 80, 443, 8080)
- Deploy network monitoring and intrusion detection systems to detect exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface or SSH if enabled. Compare against vulnerable version V9.1.0cu.2053_B20230309.Check Version:
curl -s http://router-ip/cgi-bin/luci/ | grep -i version or check admin interface System StatusVerify Fix Applied:
Verify firmware version has been updated to a version later than V9.1.0cu.2053_B20230309. Test the setEasyMeshAgentCfg endpoint with safe payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual commands in system logs
- Multiple failed authentication attempts to admin interface
- Suspicious POST requests to setEasyMeshAgentCfg endpoint
Network Indicators:
- Unusual outbound connections from router
- Traffic to known malicious IPs
- DNS queries to suspicious domains
SIEM Query:
source="router.log" AND ("setEasyMeshAgentCfg" OR "agentName=" AND ("|" OR ";" OR "$" OR "`"))