CVE-2021-45658
📋 TL;DR
This CVE describes a server-side injection vulnerability affecting multiple NETGEAR routers, extenders, and WiFi systems. Attackers can inject malicious code that executes on affected devices, potentially compromising network security. Users with vulnerable NETGEAR devices listed in the advisory are affected.
💻 Affected Systems
- NETGEAR D7800
- DM200
- EX2700
- EX6150v2
- EX6100v2
- EX6200v2
- EX6250
- EX6410
- EX6420
- EX6400v2
- EX7300
- EX6400
- EX7320
- EX7300v2
- R7500v2
- R7800
- R8900
- R9000
- RAX120
- RBK40
- RBK20
- RBR20
- RBS20
- RBK50
- RBR50
- RBS50
- RBS50Y
- WN3000RPv2
- WN3000RPv3
- WNR2000v5
- XR500
- XR700
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to intercept network traffic, modify device configuration, install persistent malware, or pivot to internal network devices.
Likely Case
Attacker gains unauthorized access to device administration functions, modifies network settings, or steals sensitive information passing through the device.
If Mitigated
Limited impact due to network segmentation, proper access controls, and monitoring preventing successful exploitation.
🎯 Exploit Status
Server-side injection typically requires minimal technical skill once exploit details are known. No public exploit code is confirmed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Minimum versions specified in CVE description (e.g., D7800 1.0.1.58 or later)
Vendor Advisory: https://kb.netgear.com/000064062/Security-Advisory-for-Server-Side-Injection-on-Some-Routers-Extenders-and-WiFi-Systems-PSV-2019-0125
Restart Required: Yes
Instructions:
1. Log into NETGEAR device admin interface. 2. Navigate to firmware update section. 3. Check for and install latest firmware. 4. Reboot device after update completes.
🔧 Temporary Workarounds
Network segmentation
allIsolate vulnerable devices from critical network segments
Access control restrictions
allLimit administrative access to trusted IP addresses only
🧯 If You Can't Patch
- Replace vulnerable devices with updated models or different vendors
- Implement strict network monitoring and intrusion detection for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check device firmware version in admin interface and compare against patched versions in advisoryCheck Version:
Log into device admin interface and navigate to firmware/status pageVerify Fix Applied:
Confirm firmware version matches or exceeds minimum patched version listed in CVE📡 Detection & Monitoring
Log Indicators:
- Unusual administrative access attempts
- Unexpected configuration changes
- Suspicious POST/GET requests to device management interface
Network Indicators:
- Anomalous traffic patterns from router/extender
- Unexpected outbound connections from device
SIEM Query:
source="netgear-device" AND (event_type="admin_access" OR event_type="config_change")