CVE-2025-4116
📋 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 get_cur_lang_ver function. This affects JWNR2000v2 routers 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, persistence, and lateral movement within the network.
Likely Case
Remote code execution allowing attackers to install malware, create backdoors, or disrupt network services.
If Mitigated
Denial of service if exploit fails or is blocked by network controls.
🎯 Exploit Status
Public proof-of-concept code exists in the referenced GitHub repository, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.netgear.com/
Restart Required: Yes
Instructions:
1. Check Netgear support site for firmware updates. 2. If available, download the latest firmware. 3. Upload firmware via router admin interface. 4. Reboot router after update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate the vulnerable router from critical internal networks
Access Control Lists
linuxRestrict access to router management interface
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Replace the vulnerable router with a supported model
- Implement strict network monitoring and anomaly detection
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under Advanced > Administration > Router UpdateCheck Version:
curl -s http://router-ip/currentsetting.htm | grep FirmwareVerify Fix Applied:
Verify firmware version is no longer 1.0.0.11 after update📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to router management interface
- Buffer overflow patterns in web server logs
Network Indicators:
- Unusual traffic to router port 80/443 from external sources
- Shellcode patterns in network traffic
SIEM Query:
source="router_logs" AND (url="*get_cur_lang_ver*" OR message="*buffer overflow*")