CVE-2025-27934: Wi-Fi AP UNIT Information Disclosure Bug

CVE-2025-27934 Overview

CVE-2025-27934 is an information disclosure vulnerability affecting the Wi-Fi AP UNIT 'AC-WPS-11ac series' manufactured by Inaba Denki Sangyo. The vulnerability exists within a specific service that improperly exposes authentication information, allowing remote unauthenticated attackers to obtain product authentication credentials without any user interaction.

This vulnerability is classified under CWE-497 (Exposure of Sensitive System Information to an Unauthorized Control Sphere), indicating that sensitive authentication data is accessible to parties who should not have access to it. The network-based attack vector combined with no authentication requirements makes this vulnerability particularly concerning for organizations deploying these wireless access points in production environments.

Critical Impact

Remote unauthenticated attackers can obtain product authentication information, potentially leading to complete compromise of affected Wi-Fi access points and unauthorized network access.

Affected Products

• Wi-Fi AP UNIT 'AC-WPS-11ac series' (Inaba Denki Sangyo)

Discovery Timeline

• 2025-04-09 - CVE CVE-2025-27934 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-27934

Vulnerability Analysis

The vulnerability resides in a specific service running on the AC-WPS-11ac series wireless access points. This service improperly handles authentication information, resulting in exposure of sensitive credentials to unauthenticated remote attackers. The flaw allows attackers to extract product authentication data without requiring any prior access or privileges on the target system.

The attack can be executed entirely over the network with low complexity, requiring no user interaction or special conditions. While the vulnerability specifically impacts confidentiality (allowing information disclosure), it does not directly enable modification of data or service disruption. However, the disclosed authentication credentials could be leveraged for subsequent attacks including unauthorized device administration, configuration changes, or lateral movement within the network.

Root Cause

The root cause is classified as CWE-497: Exposure of Sensitive System Information to an Unauthorized Control Sphere. The specific service on the affected devices fails to properly protect authentication information, making it accessible to unauthorized parties. This typically occurs when sensitive data is stored or transmitted without adequate access controls or when service endpoints inadvertently expose credential information.

Attack Vector

The attack vector is network-based, meaning an attacker can exploit this vulnerability remotely without physical access to the device. The exploitation requirements are minimal:

• No authentication required
• No user interaction needed
• Low attack complexity
• Network accessibility to the vulnerable service

An attacker with network access to the vulnerable Wi-Fi access point can query the affected service to retrieve authentication information. This information could then be used to gain administrative access to the device, reconfigure wireless settings, intercept network traffic, or pivot to other network resources.

Detection Methods for CVE-2025-27934

Indicators of Compromise

• Unusual or unauthorized access attempts to management interfaces on AC-WPS-11ac series devices
• Unexpected configuration changes on affected wireless access points
• Network reconnaissance activity targeting Wi-Fi infrastructure management ports
• Authentication logs showing successful logins from unknown or unexpected sources

Detection Strategies

• Monitor network traffic to and from AC-WPS-11ac series devices for anomalous patterns or unauthorized access attempts
• Implement intrusion detection rules to identify exploitation attempts against the vulnerable service
• Deploy network segmentation to limit exposure of wireless access point management interfaces
• Enable comprehensive logging on affected devices and forward logs to a centralized SIEM for analysis

Monitoring Recommendations

• Regularly audit access logs on AC-WPS-11ac series devices for signs of unauthorized credential access
• Implement network-based monitoring for connections to management services on affected devices
• Configure alerts for any configuration changes or administrative actions on wireless access points
• Perform periodic vulnerability scans to identify exposed instances of affected devices

How to Mitigate CVE-2025-27934

Immediate Actions Required

• Review the vendor security advisory for available patches and apply firmware updates immediately
• Restrict network access to management interfaces on affected devices using firewall rules or network segmentation
• Change all authentication credentials on affected devices as a precautionary measure
• Audit device configurations for any unauthorized changes that may indicate prior exploitation

Patch Information

Inaba Denki Sangyo has released a security update addressing this vulnerability. Organizations should review the Inaba Security Update April 2025 for detailed patch information and firmware update instructions. Additional technical details are available in the JVN Security Advisory JVNVU93925742.

Workarounds

• Isolate affected AC-WPS-11ac series devices on a dedicated management VLAN with restricted access
• Implement firewall rules to limit access to the vulnerable service from trusted management hosts only
• Deploy VPN or other secure access methods for remote administration of affected devices
• Consider temporarily disabling the affected service if operationally feasible until patches can be applied

# Example: Network segmentation for affected devices
# Restrict access to management interfaces from trusted networks only
# Configure firewall rules on upstream network equipment

# Allow management access only from trusted admin subnet
iptables -A INPUT -s 10.0.100.0/24 -d <AP_MANAGEMENT_IP> -j ACCEPT
iptables -A INPUT -d <AP_MANAGEMENT_IP> -j DROP