CVE-2025-2921
📋 TL;DR
A critical vulnerability in Netis WF-2404 routers allows attackers to exploit a default password issue via manipulation of the /etc/passwd file using 'Realtek' input. This affects physical Netis WF-2404 routers running version 1.1.124EN, potentially allowing unauthorized access to the device.
💻 Affected Systems
- Netis WF-2404
📦 What is this software?
Netis Wf 2404 Firmware by Netis Systems
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to intercept network traffic, modify configurations, install malware, or use the device as a pivot point into the internal network.
Likely Case
Unauthorized administrative access to the router leading to network configuration changes, DNS hijacking, or credential theft from connected devices.
If Mitigated
Limited impact if proper network segmentation and access controls prevent lateral movement from the compromised router.
🎯 Exploit Status
Exploit requires physical device access or network proximity; exploit details are publicly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: None
Restart Required: No
Instructions:
No official patch available. Vendor did not respond to disclosure.
🔧 Temporary Workarounds
Change Default Credentials
allImmediately change all default passwords on the router, especially administrative credentials.
Disable Unnecessary Services
allTurn off any unnecessary network services and interfaces to reduce attack surface.
🧯 If You Can't Patch
- Replace affected routers with different models from vendors that provide security updates
- Isolate affected routers in a separate VLAN with strict firewall rules limiting their network access
🔍 How to Verify
Check if Vulnerable:
Check router web interface or console for firmware version 1.1.124EN. Attempt to access /etc/passwd with 'Realtek' manipulation if possible.Check Version:
Check router admin interface under System Status or similar section for firmware version.Verify Fix Applied:
Verify that default passwords have been changed and test that the exploit no longer works.📡 Detection & Monitoring
Log Indicators:
- Unusual login attempts to router admin interface
- Configuration changes from unexpected sources
- Access to /etc/passwd file
Network Indicators:
- Unexpected traffic from router to external IPs
- DNS queries to suspicious domains from router
SIEM Query:
Search for authentication events from router IP with default credentials or failed login patterns.