CVE-2025-48461: Advantech Wise-4060lan Auth Bypass Flaw

CVE-2025-48461 Overview

CVE-2025-48461 affects Advantech WISE-4000 LAN series industrial IoT modules. The flaw stems from predictable session cookie generation, classified under [CWE-341] Predictable Numeric Value from Observable State. An unauthenticated attacker on an adjacent network can guess valid session identifiers through brute force. Successful exploitation grants root, admin, or user access and allows password resets on the device.

Critical Impact

Attackers on the local network segment can predict session cookies, hijack active sessions, and gain full administrative control over affected WISE-4010LAN, WISE-4050LAN, and WISE-4060LAN modules.

Affected Products

• Advantech WISE-4010LAN (firmware and hardware)
• Advantech WISE-4050LAN (firmware and hardware)
• Advantech WISE-4060LAN (firmware and hardware)

Discovery Timeline

• 2025-06-24 - CVE-2025-48461 published to the National Vulnerability Database
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-48461

Vulnerability Analysis

The WISE-4000 LAN series are wireless I/O modules used in industrial automation and remote monitoring. The web-based management interface authenticates users and issues a session cookie to track state. The cookie generation algorithm produces values with insufficient entropy, making outputs predictable from observable state. An attacker on an adjacent network can enumerate the valid cookie space and attach to active administrator sessions without credentials.

Once a predicted cookie is accepted, the attacker inherits the privilege level of the hijacked session. Administrative sessions expose configuration endpoints, user management, and password reset functionality. The result is full device compromise without authentication prompts or credential interaction.

Root Cause

The root cause is weak randomness in session identifier creation, aligning with [CWE-341]. Session cookies that should be unpredictable cryptographic tokens are instead derived from observable or low-entropy state. An attacker who samples several cookies, or who understands the generation pattern, can reduce the search space to a brute-forceable set.

Attack Vector

Exploitation requires adjacent network access, meaning the attacker must reach the device over the same local or routed segment. The attack does not require user interaction or prior credentials. The adversary issues HTTP requests carrying guessed cookie values until the device returns an authenticated response. Verified session cookies then enable configuration changes, password resets, and privilege escalation to root. No verified public proof-of-concept code is available at this time. Refer to the CSA Security Alert AL-2025-061 for additional technical context.

Detection Methods for CVE-2025-48461

Indicators of Compromise

• Repeated HTTP requests to the WISE-4000 management interface with varying Cookie header values from a single source address.
• Unexpected administrative actions such as password resets, user additions, or firmware configuration changes outside maintenance windows.
• Session cookies observed across multiple source IP addresses within a short interval, indicating session reuse or hijack.

Detection Strategies

• Monitor network traffic to WISE-4000 management ports for high-rate cookie enumeration patterns and HTTP 200 responses following prior 401/403 responses.
• Baseline normal management traffic volume and alert on sudden spikes from unexpected hosts on the OT segment.
• Correlate device audit logs with network flow data to identify administrative actions not preceded by a successful login event.

Monitoring Recommendations

• Enable logging on the WISE-4000 web interface and forward logs to a central SIEM or data lake for retention and analysis.
• Track configuration drift on industrial endpoints and alert on changes to authentication, user accounts, or network settings.
• Deploy passive network monitoring on OT segments to flag non-engineering-workstation sources communicating with WISE devices.

How to Mitigate CVE-2025-48461

Immediate Actions Required

• Isolate affected WISE-4010LAN, WISE-4050LAN, and WISE-4060LAN devices onto a dedicated management VLAN with strict access control lists.
• Restrict management interface access to known engineering workstations and jump hosts only.
• Review device logs and user accounts for unauthorized changes or newly created accounts.
• Consult the CSA Security Alert AL-2025-061 for vendor guidance and firmware availability.

Patch Information

No vendor patch URL is listed in the available advisory data. Operators should contact Advantech support directly and monitor the CSA Security Alert AL-2025-061 for updated firmware releases addressing the predictable session cookie issue.

Workarounds

• Place affected devices behind a firewall that terminates management traffic and enforces source-IP allowlisting.
• Require VPN or bastion-host access for any interaction with WISE device management interfaces.
• Disable the web management interface where device functionality can be managed via alternative, authenticated channels.
• Rotate device administrative passwords and audit access regularly until firmware remediation is confirmed.

# Example: restrict access to WISE-4000 management interface using iptables
# Allow only the engineering workstation subnet to reach the device
iptables -A FORWARD -s 10.10.50.0/24 -d 10.20.0.0/16 -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -d 10.20.0.0/16 -p tcp --dport 80 -j DROP