ZKTeco WL20 Biometric Attendance System up to 3.1.8 cleartext storage

Summaryinfo

A vulnerability classified as problematic has been found in ZKTeco WL20 Biometric Attendance System up to 3.1.8. This affects an unknown function. Performing a manipulation results in cleartext storage. This vulnerability is cataloged as CVE-2025-55280. The attack may be carried out on the physical device. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in ZKTeco WL20 Biometric Attendance System up to 3.1.8. This affects some unknown processing. The manipulation with an unknown input leads to a cleartext storage vulnerability. CWE is classifying the issue as CWE-312. The product stores sensitive information in cleartext within a resource that might be accessible to another control sphere. This is going to have an impact on confidentiality. The summary by CVE is:

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.

The weakness was shared by Shravan Singh as CIVN-2025-0172. It is possible to read the advisory at cert-in.org.in. This vulnerability is uniquely identified as CVE-2025-55280 since 08/12/2025. The exploitability is told to be easy. Attacking locally is a requirement. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1555 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-24561). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• ZKTeco

Name

• WL20 Biometric Attendance System

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6
• 3.1.7
• 3.1.8

CPE 2.3info

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• 🔒
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CPE 2.2info

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• 🔒

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Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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