CVE-2020-3933Network attack vector

Unauthenticated account enumeration via undisclosed interface

Published Feb 11, 2020 · Updated Sep 17, 2024

User account enumeration in Taiwan Secom Integrated Access Control and Personnel Attendance systems allows remote attackers to identify accounts. The published advisories do not identify the request endpoint, input, response difference, or other operation that exposes account existence. No authentication or user interaction is required; the documented consequence is disclosure of valid account information, not account access or data modification.

CVSS severity5.3
Medium
EPSS probability1.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

User account enumeration in Taiwan Secom Integrated Access Control and Personnel Attendance systems allows remote attackers to identify accounts. The published advisories do not identify the request endpoint, input, response difference, or other operation that exposes account existence. No authentication or user interaction is required; the documented consequence is disclosure of valid account information, not account access or data modification.

The record

CVE
CVE-2020-3933
Published
Feb 11, 2020
Updated
Sep 17, 2024
Vendor
Taiwan Secom Co., Ltd.
Product
Personnel Attendance Management System
Classifications
T1087
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record 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=0 <=3.3.0.3_20160517

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Taiwan Secom Co., Ltd. · Personnel Attendance Management Systemversion=0 <=3.3.0.3_20160517
Taiwan Secom Co., Ltd. · Integrated Access Controlversion=0 <=3.3.2

Published CVSS scores

5.3TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A: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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1087Account Discovery

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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