CVE-2025-54465: ZKTeco Co WL20 Biometric Attendance System

Medium severity, CVSS 6.8. EPSS: 0.2% chance of exploitation in the next 30 days.

This vulnerability exists in ZKTeco WL20 due to hard-coded MQTT credentials and endpoints stored in plaintext within the device firmware. An attacker with physical access could exploit this vulnerability by extracting the firmware and analyzing the binary data to retrieve the hard-coded MQTT credentials and endpoints from the targeted device. Successful exploitation of this vulnerability could allow the attacker to gain unauthorized access to the MQTT broker and manipulate the communications of 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.