CVE-2017-18777
📋 TL;DR
This vulnerability allows unauthenticated attackers to retrieve the administrative password from affected NETGEAR routers and gateways. Attackers can exploit this to gain full administrative control over the device. The vulnerability affects specific NETGEAR router and gateway models running outdated firmware versions.
💻 Affected Systems
- NETGEAR D6220
- D6400
- D8500
- DGN2200v4
- DGN2200Bv4
- R6300v2
- R6400
- R6700
- R6900
- R7000
- R7100LG
- R7300DST
- R7900
- R8000
- R8300
- R8500
- WNDR3400v3
- WNR3500Lv2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise allowing attackers to change DNS settings, intercept traffic, install malware, or use the device as part of a botnet.
Likely Case
Unauthorized administrative access leading to network configuration changes, credential theft, and potential lateral movement into connected devices.
If Mitigated
Limited impact if device is not internet-facing and network segmentation prevents access to administrative interfaces.
🎯 Exploit Status
The vulnerability allows unauthenticated password disclosure via a specific URL endpoint. Exploitation requires network access to the router's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions specified in the CVE description (e.g., D6220 V1.0.0.28 or later)
Vendor Advisory: https://kb.netgear.com/000049551/Security-Advisory-for-Administrative-Password-Disclosure-on-Some-Routers-and-Gateways-PSV-2017-0385
Restart Required: Yes
Instructions:
1. Log into router web interface. 2. Navigate to Advanced > Administration > Router Update. 3. Check for firmware updates. 4. Download and install latest firmware. 5. Reboot router after update completes.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external attackers from accessing the administrative interface
Change Default Admin Password
allMitigates impact if password is disclosed (though still vulnerable to disclosure)
🧯 If You Can't Patch
- Replace affected devices with supported models
- Implement network segmentation to isolate router administrative interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version against affected versions list. Attempt to access password disclosure endpoint if testing is authorized.Check Version:
Log into router web interface and check firmware version in Advanced > Administration > Router StatusVerify Fix Applied:
Verify firmware version is updated to patched version. Test that password disclosure endpoint no longer returns credentials.📡 Detection & Monitoring
Log Indicators:
- Unusual access to administrative interface
- Multiple failed login attempts followed by successful login from new IP
Network Indicators:
- Unusual traffic patterns from router
- DNS changes not initiated by administrator
SIEM Query:
source="router_logs" AND (url="*password*" OR action="admin_login")