CVE-2020-3921Network attack vector

Account credential disclosure via cleartext storage

Published Mar 27, 2020 · Updated Sep 17, 2024

Cleartext storage in Unisoon UltraLog Express 1.4.0 allows remote attackers to retrieve account UIDs, names, and passwords through a page. The device-management software stores UID, account-name, and password values without encryption and exposes them through an unspecified page. No authentication or user interaction is required, and public sources do not identify the page or state whether access is limited to a network segment.

CVSS severity8.6
High
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext storage in Unisoon UltraLog Express 1.4.0 allows remote attackers to retrieve account UIDs, names, and passwords through a page. The device-management software stores UID, account-name, and password values without encryption and exposes them through an unspecified page. No authentication or user interaction is required, and public sources do not identify the page or state whether access is limited to a network segment.

The record

CVE
CVE-2020-3921
Published
Mar 27, 2020
Updated
Sep 17, 2024
Vendor
Unisoon
Product
UltraLog Express Firmware
Classifications
CWE-312, T1555
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 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=1.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Unisoon · UltraLog Express Firmwareversion=1.4.0
Unisoon · UltraLog Expressversion=1.4.0

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.6TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-312Cleartext Storage of Sensitive Information
T1555Credentials from Password Stores

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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