CVE-2025-55279

Sensitive-data decryption via plaintext firmware key

Published Aug 13, 2025 · Updated Aug 13, 2025

Hard-coded key storage in ZKTeco WL20 Wi-Fi firmware ZLM31-FXO1-3.1.8 and earlier allows physically proximate attackers to decrypt data. The Wi-Fi module firmware stores a private key in plaintext, allowing recovery by disassembling the device, extracting the firmware, and analyzing its binary data. Physical possession and firmware extraction are required; the recovered key enables unauthorized decryption and man-in-the-middle attacks against the device.

CVSS severity6.9
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded key storage in ZKTeco WL20 Wi-Fi firmware ZLM31-FXO1-3.1.8 and earlier allows physically proximate attackers to decrypt data. The Wi-Fi module firmware stores a private key in plaintext, allowing recovery by disassembling the device, extracting the firmware, and analyzing its binary data. Physical possession and firmware extraction are required; the recovered key enables unauthorized decryption and man-in-the-middle attacks against the device.

The record

CVE
CVE-2025-55279
Published
Aug 13, 2025
Updated
Aug 13, 2025
Vendor
ZKTeco
Product
WL20
Classifications
CWE-798, T1552.001
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<=ZLM31-FXO1-3.1.8

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

ZKTeco · WL20version=<=ZLM31-FXO1-3.1.8

Published CVSS scores

6.9Indian Computer Emergency Response Team (CERT-In)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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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