CVE-2020-26899
📋 TL;DR
This vulnerability in certain NETGEAR WiFi systems allows unauthorized disclosure of sensitive information. Attackers can potentially access confidential data stored on affected devices. The vulnerability impacts specific NETGEAR CBR40, RBK752, RBR750, RBS750, RBK852, RBR850, and RBS850 devices running outdated firmware versions.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
Complete compromise of sensitive device information including credentials, configuration data, and potentially user data, leading to full network compromise.
Likely Case
Unauthorized access to device configuration information and potentially user credentials stored on the device.
If Mitigated
Limited information exposure with proper network segmentation and access controls in place.
🎯 Exploit Status
Vulnerability allows information disclosure without authentication, making exploitation straightforward if accessible.
🛠️ 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/000062355/Security-Advisory-for-Sensitive-Information-Disclosure-on-Some-WiFi-Systems-PSV-2020-0030
Restart Required: Yes
Instructions:
1. Log into NETGEAR router admin interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates and apply the latest firmware. 4. Reboot the device after update completes.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices from untrusted networks and limit access to management interfaces.
Access Control Lists
allImplement firewall rules to restrict access to device management interfaces.
🧯 If You Can't Patch
- Isolate affected devices in a separate VLAN with strict access controls
- Disable remote management features and limit administrative access to trusted IP addresses only
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via router admin interface under Advanced > Administration > Firmware UpdateCheck Version:
Check via router web interface or use NETGEAR Nighthawk appVerify Fix Applied:
Verify firmware version matches or exceeds patched versions: CBR40 >= 2.5.0.10, RBK752/RBR750/RBS750 >= 3.2.15.25, RBK852/RBR850/RBS850 >= 3.2.10.11📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to device management interfaces
- Unusual requests to sensitive endpoints
Network Indicators:
- Unexpected traffic to router management ports from untrusted sources
SIEM Query:
source_ip IN (untrusted_networks) AND dest_port IN (80,443,8080) AND dest_ip IN (router_ips) AND http_uri CONTAINS 'sensitive'