CVE-2025-4114
📋 TL;DR
A critical buffer overflow vulnerability in Netgear JWNR2000v2 routers allows remote attackers to execute arbitrary code by manipulating the host argument in the check_language_file function. This affects users running firmware version 1.0.0.11. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Netgear JWNR2000v2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and persistent backdoor installation.
Likely Case
Device crash (DoS) or limited code execution to steal credentials and pivot to internal networks.
If Mitigated
Limited impact if device is isolated behind firewalls with strict inbound filtering.
🎯 Exploit Status
Public exploit details available in GitHub repository; weaponization likely due to low complexity and remote unauthenticated nature.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://www.netgear.com/
Restart Required: No
Instructions:
No official patch available. Vendor did not respond to disclosure. Consider workarounds or replacement.
🔧 Temporary Workarounds
Network segmentation and firewall rules
allIsolate vulnerable routers from internet and restrict internal access.
Disable web management interface
allPrevent exploitation by disabling remote web access if possible.
🧯 If You Can't Patch
- Replace affected routers with supported models
- Implement strict network segmentation and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version via router web interface at Administration > Router Status > Firmware Version.Check Version:
Not applicable via command line; use web interface as above.Verify Fix Applied:
Verify firmware version is no longer 1.0.0.11 (though no patch exists).📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to language-related endpoints
- Router crash/reboot logs
Network Indicators:
- Unexpected outbound connections from router
- Exploit pattern traffic to router web interface
SIEM Query:
Search for HTTP requests containing suspicious host parameter values targeting router IP on port 80/443.