CVE-2025-15548: VX800v Information Disclosure Flaw

CVE-2025-15548 Overview

CVE-2025-15548 is a Missing Encryption of Sensitive Data vulnerability (CWE-311) affecting the TP-Link VX800v v1.0 web interface. The device's web management endpoints transmit sensitive information over unencrypted HTTP connections due to missing application layer encryption, enabling network adjacent attackers to intercept traffic and compromise data confidentiality.

Critical Impact

Network adjacent attackers can passively intercept sensitive data including authentication credentials, configuration settings, and management commands transmitted between administrators and the device's web interface.

Affected Products

• TP-Link VX800v v1.0
• VX800v web interface endpoints

Discovery Timeline

• 2026-01-29 - CVE-2025-15548 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2025-15548

Vulnerability Analysis

This vulnerability stems from the absence of transport layer security (TLS/SSL) on the VX800v's web management interface. When administrators access the device's configuration portal, all HTTP traffic—including login credentials, session tokens, and configuration data—is transmitted in cleartext across the local network segment.

The attack requires the adversary to be positioned on the same network segment as either the administrator or the device itself. From this position, the attacker can employ passive network sniffing techniques to capture sensitive data without actively interacting with the target device, making detection particularly challenging.

The confidentiality impact is limited to data exposure without direct integrity or availability consequences. However, captured credentials could enable secondary attacks including unauthorized device reconfiguration, network pivoting, or persistence establishment.

Root Cause

The root cause is the absence of application layer encryption (HTTPS/TLS) for the VX800v web management interface. The device accepts and processes administrative requests over plaintext HTTP, failing to implement cryptographic protections that would prevent network eavesdropping. This architectural deficiency means all data exchanged between the administrator's browser and the device's web server traverses the network in readable form.

Attack Vector

The attack vector is adjacent network (AV:A), meaning the attacker must have access to the same network segment as the target device or its administrators. Exploitation follows this general pattern:

1. The attacker positions themselves on the local network segment (via wireless access, physical network connection, or compromised adjacent host)
2. Network traffic is captured using passive sniffing tools
3. HTTP traffic to/from the VX800v web interface is filtered and analyzed
4. Sensitive data including authentication credentials, session identifiers, and configuration parameters are extracted from captured packets

The attack requires no authentication, no user interaction, and has low complexity—the attacker simply needs network adjacency and packet capture capability.

Detection Methods for CVE-2025-15548

Indicators of Compromise

• Unusual ARP traffic patterns indicating potential ARP spoofing attacks targeting the VX800v device
• Presence of promiscuous mode network interfaces on hosts within the same network segment
• Unexpected login sessions to the VX800v management interface from unrecognized internal IP addresses
• Configuration changes to the device that were not authorized by legitimate administrators

Detection Strategies

• Monitor for ARP anomalies and potential man-in-the-middle positioning attacks on the network segment containing the VX800v
• Implement network traffic analysis to detect cleartext credential patterns in HTTP traffic to device management interfaces
• Deploy intrusion detection rules to alert on HTTP authentication traffic to known IoT/network device management ports
• Audit VX800v access logs for login attempts from unexpected source addresses

Monitoring Recommendations

• Enable comprehensive logging on the VX800v device and forward logs to a centralized SIEM for correlation analysis
• Implement network segmentation monitoring to detect unauthorized access to the management VLAN
• Deploy endpoint detection capabilities on administrator workstations to identify potential credential theft post-exploitation
• Regularly review device configuration for unauthorized changes that may indicate successful credential compromise

How to Mitigate CVE-2025-15548

Immediate Actions Required

• Isolate the VX800v management interface to a dedicated, physically secured management VLAN with strict access controls
• Restrict administrative access to the device from trusted endpoints only, using firewall rules or access control lists
• Avoid accessing the VX800v web interface from shared or untrusted network segments
• Consider using a VPN or SSH tunnel when remote management access is required

Patch Information

TP-Link has made firmware resources available for the VX800v. Administrators should check the TP-Link VX800v Firmware Download page for the latest firmware version that may address this vulnerability. Additionally, the TP-Link Support FAQ provides guidance on device security and configuration best practices.

Workarounds

• Place the VX800v on an isolated management network segment inaccessible from general user networks
• Implement MAC address filtering and port security on switch ports connected to the device
• Use a jump host or bastion server for administrative access, ensuring the jump host uses encrypted connections
• Disable remote web management if not required and configure the device only via local console access when possible
• Monitor network traffic for signs of passive eavesdropping or active interception attempts

# Network segmentation example - isolate management interface
# Configure VLAN for device management (example for managed switch)
# Create dedicated management VLAN
vlan 100
  name DEVICE_MGMT
  
# Apply access control to restrict management VLAN access
ip access-list extended MGMT_ACL
  permit ip host 192.168.100.10 192.168.100.0 0.0.0.255
  deny ip any 192.168.100.0 0.0.0.255 log