CVE-2025-55279

Hard-coded Private Key Vulnerability in ZKTeco WL20

Published Aug 13, 2025 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Description
This vulnerability exists in ZKTeco WL20 due to hard-coded private key 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 private key stored in the firmware of the targeted device.

Successful exploitation of this vulnerability could allow the attacker to perform unauthorized decryption of sensitive data and Man-in-the-Middle (MitM) attacks on the targeted device.

Remediation

Vendor Workaround

* Apply mitigations as per vendor instructions (whenever available) or discontinue the use of the product if mitigations are unavailable. * Perform risk assessment and implement physical security controls to prevent unauthorized access to the device.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-24556 This vulnerability exists in ZKTeco WL20 due to hard-coded private key 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 private key stored in the firmware of the targeted device. Successful exploitation of this vulnerability could allow the attacker to perform unauthorized decryption of sensitive data and Man-in-the-Middle (MitM) attacks on the targeted device.
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description This vulnerability exists in ZKTeco WL20 due to hard-coded private key 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 private key stored in the firmware of the targeted device. Successful exploitation of this vulnerability could allow the attacker to perform unauthorized decryption of sensitive data and Man-in-the-Middle (MitM) attacks on the targeted device.
Title Hard-coded Private Key Vulnerability in ZKTeco WL20
Weaknesses CWE-798
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N'}

Subscriptions

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Weaknesses

Sources

Status
PUBLISHED
Assigner
CERT-In
Published
Updated
Aug 13, 2025, 1:01 PM
Reserved
Aug 12, 2025, 11:08 AM
Status
Deferred
Published
Aug 13, 2025, 12:15 PM
Modified
Jun 17, 2026, 9:41 AM