CVE-2025-55280: ZKTeco Co WL20 Biometric Attendance System

Medium severity, CVSS 5.2. EPSS: 0.1% chance of exploitation in the next 30 days.

This vulnerability exists in ZKTeco WL20 due to storage of Wi-Fi credentials, configuration data and system data in plaintext within the device firmware. An attacker with physical access could exploit this vulnerability by extracting the firmware and reverse engineer the binary data to access the plaintext sensitive data stored in the targeted device. Successful exploitation of this vulnerability could allow the attacker to gain unauthorized network access, retrieve and manipulate data on the targeted device.

Affected products

• ZKTeco Co WL20 Biometric Attendance System: up to and including ZLM31-FXO1-3.1.8

Published 2025-08-13. Last modified 2026-06-17.