CVE-2025-44846
📋 TL;DR
This CVE describes a command injection vulnerability in TOTOLINK CA600-PoE routers that allows attackers to execute arbitrary commands via the fwUrl parameter in the recvUpgradeNewFw function. Attackers can exploit this to gain unauthorized access, modify device configurations, or launch further attacks. Organizations using affected TOTOLINK CA600-PoE routers are at risk.
💻 Affected Systems
- TOTOLINK CA600-PoE
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise allowing attackers to install persistent backdoors, pivot to internal networks, intercept network traffic, or brick devices.
Likely Case
Unauthorized command execution leading to device configuration changes, credential theft, or use as a foothold for lateral movement.
If Mitigated
Limited impact if devices are behind firewalls with strict network segmentation and command execution is restricted via security controls.
🎯 Exploit Status
The GitHub reference includes technical details that could facilitate exploitation. Command injection vulnerabilities are typically easy to weaponize.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch is currently documented. Check TOTOLINK's official website for firmware updates and security advisories.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected routers in a separate VLAN with strict firewall rules to limit attack surface.
Disable Unnecessary Services
allDisable remote firmware upgrade functionality if not required for operations.
🧯 If You Can't Patch
- Implement strict network access controls to limit traffic to affected devices only from trusted sources.
- Monitor network traffic for unusual patterns and implement intrusion detection rules for command injection attempts.
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface or SSH. If version is V5.3c.6665_B20180820, device is vulnerable.Check Version:
Login to router admin interface and check firmware version in System Status or similar section.Verify Fix Applied:
Verify firmware has been updated to a version newer than V5.3c.6665_B20180820 and test recvUpgradeNewFw function with controlled inputs.📡 Detection & Monitoring
Log Indicators:
- Unusual firmware upgrade requests
- Suspicious commands in system logs
- Failed authentication attempts followed by upgrade requests
Network Indicators:
- HTTP POST requests to upgrade endpoints with unusual parameters
- Outbound connections from router to unexpected destinations
SIEM Query:
source="router_logs" AND (event="firmware_upgrade" OR event="command_execution") AND (param="fwUrl" OR command="*;*" OR command="*|*")