CVE-2025-55901
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on TOTOLINK A3300R routers by injecting malicious input into the host_time parameter of the NTPSyncWithHost function. Attackers can potentially gain full control of affected devices. Users of TOTOLINK A3300R routers with vulnerable firmware are affected.
💻 Affected Systems
- TOTOLINK A3300R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attackers to intercept traffic, modify configurations, pivot to internal networks, or deploy persistent malware.
Likely Case
Router takeover enabling traffic monitoring, DNS hijacking, credential theft, and network disruption.
If Mitigated
Limited impact if routers are behind firewalls with strict inbound filtering and command injection attempts are blocked.
🎯 Exploit Status
The GitHub reference contains technical details that could be used to create exploits. Command injection vulnerabilities are typically easy to weaponize.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.totolink.net
Restart Required: Yes
Instructions:
1. Check TOTOLINK website for firmware updates. 2. Download latest firmware for A3300R. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router administration interface
Network segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Replace vulnerable routers with patched or different models
- Implement strict network filtering to block access to router administration interfaces from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is V17.0.0cu.596_B20250515, device is vulnerable.Check Version:
Login to router admin interface and check System Status or Firmware Information page.Verify Fix Applied:
After firmware update, verify version has changed from V17.0.0cu.596_B20250515 to a newer version.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in router logs
- Multiple failed login attempts followed by successful access
- Unexpected configuration changes
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Traffic redirection patterns
SIEM Query:
source="router_logs" AND ("command injection" OR "NTPSyncWithHost" OR suspicious shell commands)