CVE-2021-45496
📋 TL;DR
This vulnerability allows attackers to bypass authentication on NETGEAR D7000 routers, potentially gaining administrative access without valid credentials. It affects NETGEAR D7000 devices running firmware versions before 1.0.1.82. This could allow unauthorized control of home or small business network infrastructure.
💻 Affected Systems
- NETGEAR D7000
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to reconfigure network settings, intercept traffic, install malware, or use the device as a pivot point into the internal network.
Likely Case
Unauthorized access to router administration panel leading to network configuration changes, DNS hijacking, or credential theft from connected devices.
If Mitigated
Limited impact if router is not internet-facing and network segmentation prevents lateral movement from compromised devices.
🎯 Exploit Status
Authentication bypass vulnerabilities are typically easy to exploit once discovered, and this affects consumer-grade routers which are common targets.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.1.82 or later
Vendor Advisory: https://kb.netgear.com/000064529/Security-Advisory-for-Authentication-Bypass-on-D7000-PSV-2021-0060
Restart Required: Yes
Instructions:
1. Log into router admin panel. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates and install version 1.0.1.82 or later. 4. Reboot router after update completes.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external attackers from accessing the router administration interface from the internet.
Log into router admin panel > Advanced > Remote Management > Disable
Change Default Admin Credentials
allWhile this doesn't fix the bypass, it adds an additional layer of protection if the bypass is mitigated.
Log into router admin panel > Advanced > Administration > Set Password > Change admin password
🧯 If You Can't Patch
- Replace the router with a supported model that receives security updates
- Isolate the router on a separate network segment to limit potential damage
🔍 How to Verify
Check if Vulnerable:
Access router admin panel at 192.168.1.1 or routerlogin.net and check firmware version in Advanced > Administration > Firmware UpdateCheck Version:
curl -s http://192.168.1.1/currentsetting.htm | grep FirmwareVerify Fix Applied:
Confirm firmware version is 1.0.1.82 or later in the router administration interface📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful admin access
- Admin panel access from unusual IP addresses
- Configuration changes without authorized user activity
Network Indicators:
- Unexpected DNS server changes
- New port forwarding rules
- Unusual outbound traffic from router
SIEM Query:
source="router.log" AND (event="admin_login" OR event="config_change") AND user="admin" AND src_ip NOT IN [authorized_admin_ips]