CVE-2025-7407
📋 TL;DR
This critical vulnerability in Netgear D6400 routers allows remote attackers to execute arbitrary operating system commands via command injection in the diag.cgi file's host_name parameter. It affects only Netgear D6400 routers running firmware version 1.0.0.114, which are no longer supported by the vendor.
💻 Affected Systems
- Netgear D6400
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attacker to install persistent backdoors, pivot to internal networks, steal credentials, or brick the device.
Likely Case
Remote code execution leading to device takeover, network monitoring, or participation in botnets.
If Mitigated
Limited impact if device is isolated behind firewalls with strict network segmentation and command execution restrictions.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available on GitHub. Attack requires network access to the router's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch available since product is end-of-life. Replace affected hardware with supported models.
🔧 Temporary Workarounds
Disable WAN access to web interface
linuxBlock external access to router administration interface
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Network segmentation
allIsolate affected routers in separate VLAN with restricted access
🧯 If You Can't Patch
- Immediately replace affected Netgear D6400 routers with supported models
- Implement strict network segmentation and firewall rules to limit access to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at http://routerlogin.com or SSH if enabled. Version 1.0.0.114 is vulnerable.Check Version:
curl -s http://routerlogin.com/currentsetting.htm | grep FirmwareVerify Fix Applied:
Verify router has been replaced with supported model or firmware version is different from 1.0.0.114.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to diag.cgi with shell metacharacters in parameters
- Unexpected command execution in system logs
Network Indicators:
- HTTP requests to diag.cgi containing shell commands in host_name parameter
- Outbound connections from router to suspicious IPs
SIEM Query:
source="router.log" AND (uri="*diag.cgi*" AND (param="*host_name*" AND value="*;*" OR value="*|*" OR value="*`*"))🔗 References
- https://github.com/wudipjq/my_vuln/blob/main/Netgear7/vuln_66/66.md
- https://github.com/wudipjq/my_vuln/blob/main/Netgear7/vuln_66/66.md#poc
- https://vuldb.com/?ctiid.315867
- https://vuldb.com/?id.315867
- https://vuldb.com/?submit.603668
- https://www.netgear.com/
- https://github.com/wudipjq/my_vuln/blob/main/Netgear7/vuln_66/66.md
- https://github.com/wudipjq/my_vuln/blob/main/Netgear7/vuln_66/66.md#poc
