CVE-2020-26897
📋 TL;DR
This vulnerability allows attackers to retrieve administrative credentials from affected NETGEAR WiFi systems. Attackers could gain full administrative control over the devices. Affected devices include specific models of NETGEAR Orbi and Nighthawk WiFi systems running vulnerable firmware versions.
💻 Affected Systems
- NETGEAR CBR40
- NETGEAR RBK752
- NETGEAR RBR750
- NETGEAR RBS750
- NETGEAR RBK852
- NETGEAR RBR850
- NETGEAR RBS850
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full compromise of the WiFi system allowing attackers to intercept all network traffic, modify device configurations, install malware, and pivot to other connected devices.
Likely Case
Attackers gain administrative access to the router, enabling them to change DNS settings, redirect traffic, or disable security features.
If Mitigated
If proper network segmentation and monitoring are in place, impact may be limited to the compromised device only.
🎯 Exploit Status
Credential disclosure vulnerability typically requires network access to the device's management interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: CBR40: 2.5.0.10 or later; RBK752/RBR750/RBS750: 3.2.15.25 or later; RBK852/RBR850/RBS850: 3.2.10.11 or later
Vendor Advisory: https://kb.netgear.com/000062357/Security-Advisory-for-Admin-Credential-Disclosure-on-Some-WiFi-Systems-PSV-2020-0045
Restart Required: Yes
Instructions:
1. Log into NETGEAR router admin interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates and apply if available. 4. Reboot device after update completes.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external access to the admin interface
Change Admin Credentials
allChange default admin password to strong unique password
🧯 If You Can't Patch
- Isolate affected devices in separate VLAN with restricted access
- Implement network monitoring for unusual admin login attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under Advanced > Administration > Firmware UpdateCheck Version:
Check via web interface or use NETGEAR Nighthawk appVerify Fix Applied:
Confirm firmware version matches or exceeds patched versions listed in advisory📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful admin login
- Admin login from unusual IP addresses
Network Indicators:
- Unusual traffic to router admin port (typically 80/443)
- DNS configuration changes without authorization
SIEM Query:
source="router_logs" AND (event="admin_login" AND src_ip NOT IN [authorized_ips])