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How CVE-2025-46635 Works
The vulnerability in Tenda RX2 Pro routers (v16.03.30.14) stems from improper isolation between guest Wi-Fi and other network interfaces. An attacker connected to the guest network can bypass intended restrictions by manually configuring a static IP address within the non-guest subnet (e.g., 192.168.1.0/24). This misconfiguration allows unauthorized access to router admin interfaces, LAN devices, and adjacent networks. The router fails to enforce proper firewall rules or VLAN segregation, enabling lateral movement. Attackers exploit this flaw by assigning their device an IP within the trusted range, granting them the same access as local users.
DailyCVE Form
Platform: Tenda RX2 Pro
Version: 16.03.30.14
Vulnerability: Network Isolation Bypass
Severity: Critical
Date: 05/27/2025
Prediction: Patch expected by 06/15/2025
What Undercode Say:
Exploitation Commands
1. Identify Guest Network Subnet:
ifconfig | grep "inet"
2. Assign Static IP in Trusted Range:
sudo ifconfig eth0 192.168.1.100 netmask 255.255.255.0
3. Scan LAN Devices:
nmap -sn 192.168.1.0/24
4. Access Router Admin:
curl http://192.168.1.1/login.cgi
Mitigation Steps
1. Temporary Workaround:
iptables -A FORWARD -i wlan0 -o eth0 -j DROP
2. Firmware Update Check:
opkg update && opkg list-upgradable
3. Isolate Guest Network via VLAN:
vconfig add eth0 100 ifconfig eth0.100 up
Detection Script (Python)
import scapy.all as scapy def check_guest_leak(target_ip): pkt = scapy.ARP(pdst=target_ip) response = scapy.srp(pkt, timeout=2, verbose=False)[bash] return response[bash][1].hwsrc if response else None
Router Hardening
1. Disable guest Wi-Fi if unused.
2. Enable MAC filtering for admin interfaces.
3. Log all unauthorized IP assignments:
grep "DHCP lease" /var/log/messages
CVSS 4.0 Metrics
- Attack Vector: Network
- Complexity: Low
- Privileges Required: None (Guest)
- Impact: Confidentiality, Integrity, Availability
Expected Patch Actions
1. Firmware update enforcing VLAN tagging.
2. Strict firewall rules between subnets.
3. DHCP snooping to block static IP spoofing.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
