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CVE Record

CVE-2020-3920: Unisoon UltraLog Express - Broken Authentication

UltraLog Express device management interface does not properly perform access authentication in some specific pages/functions. Any user can access the privileged page to manage accounts through specific system directory.

HighCVSS 8.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

UltraLog Express 1.4.0 has a broken-authentication flaw in its device management interface. A low-privileged user may reach privileged account-management functions through a specific system directory. For organizations using this product, the main business risk is unauthorized account control, which can compromise confidentiality and integrity.

Executive priority

Prioritize remediation where UltraLog Express 1.4.0 manages sensitive devices or is reachable by many internal users. Treat this as high urgency because account control can enable broader operational compromise.

Technical view

The CVE describes improper access authentication on specific pages/functions in Unisoon UltraLog Express 1.4.0. CVSS 3.1 is 8.1, with network access, low attack complexity, low privileges required, no user interaction, high confidentiality impact, high integrity impact, and no availability impact.

Likely exposure

Exposure is limited to Unisoon UltraLog Express version 1.4.0, especially deployments where the device management interface is reachable by non-administrative users or broad internal networks.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation. The scoring indicates exploitation requires network reachability and low privileges, not anonymous access.

Researcher notes

Evidence is concise and does not name a CWE, patch version, exploit publication, or observed exploitation. The PR:L CVSS metric should guide testing: focus on authenticated authorization bypass, not unauthenticated exploitation.

Mitigation direction

  • Inventory UltraLog Express deployments and confirm whether version 1.4.0 is present.
  • Restrict management interface access to trusted administrative networks only.
  • Check Unisoon or TWCERT guidance for fixed versions or vendor-approved remediation.
  • Review and remove unauthorized or unnecessary accounts.
  • Monitor account-management activity until remediation is confirmed.

Validation and detection

  • Confirm whether any UltraLog Express instance reports version 1.4.0.
  • Verify management interfaces are not exposed to untrusted networks.
  • Perform authorized access-control testing for account-management pages.
  • Review logs for unexpected account creation, deletion, or privilege changes.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2020-3920 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.1CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N2.85.2Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

8.1High
CVSS 3.1 vector shape for CVE-2020-3920Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
UnisoonUltraLog Express1.4.0unaffected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.