CVE-2025-4978
📋 TL;DR
This vulnerability allows remote attackers to bypass authentication on Netgear DGND3700 routers via manipulation of the /BRS_top.html file. Attackers can gain unauthorized access to the router's administrative interface without credentials. This affects Netgear DGND3700 routers running vulnerable firmware versions.
💻 Affected Systems
- Netgear DGND3700
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to change network settings, intercept traffic, install malware, or use the device as part of a botnet.
Likely Case
Unauthorized access to router administration leading to DNS hijacking, network monitoring, or credential theft from connected devices.
If Mitigated
Limited impact if router is behind additional firewalls, has restricted administrative access, or uses non-default credentials.
🎯 Exploit Status
Exploit details are publicly available on GitHub. The vulnerability requires no authentication and is remotely exploitable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.netgear.com/
Restart Required: Yes
Instructions:
1. Check Netgear support site for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Navigate to firmware update section. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router administration interface
Change Default Credentials
allUse strong, unique passwords for router administration
🧯 If You Can't Patch
- Isolate vulnerable routers in separate network segments
- Implement network monitoring for unauthorized access attempts to router administration
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 1.1.00.15_1.00.15NA, the device is vulnerable.Check Version:
Access router web interface at http://routerlogin.net or router IP, navigate to Advanced > Administration > Router UpdateVerify Fix Applied:
Verify firmware version has been updated to a version later than 1.1.00.15_1.00.15NA.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful access
- Unauthorized access to /BRS_top.html
Network Indicators:
- External IP addresses accessing router administration port
- Unusual traffic patterns from router
SIEM Query:
source="router" AND (url="/BRS_top.html" OR event="authentication bypass")