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Cleartext TransmissionWeakness · CWE-319

CVE-2025-5087

MEDIUM · 6.0 CVSS v4.0 Published 2025-06-24
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
67/100
Remediation priority · Elevated
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Kaleris NAVIS N4 ULC (Ultra Light Client) communicates insecurely using zlib-compressed data over HTTP. An attacker capable of observing network traffic between Ultra Light Clients and N4 servers can extract sensitive information, including plaintext credentials.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

The Kaleris NAVIS N4 Ultra Light Client transmits zlib-compressed data over unencrypted HTTP, allowing network eavesdroppers to intercept and decompress traffic containing sensitive information such as plaintext credentials.

MitigationEnable TLS encryption (HTTPS) for all communication between Ultra Light Clients and N4 servers to protect data in transit.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
High
Privileges
None
Authentication
X
User interaction
P
Scope
X

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify NAVIS N4 Ultra Light Client installation
    Locate the client application or configuration files associated with Kaleris NAVIS N4 Ultra Light Client in your environment
    Affected if The NAVIS N4 Ultra Light Client software is present and active in the environment
  2. Determine the protocol used for client-server communication
    Examine the connection settings, configuration files, or network traffic to identify whether HTTP or HTTPS is being used for communication between Ultra Light Clients and the N4 server
    Affected if HTTP (unencrypted) is used instead of HTTPS for client-server communication
  3. Verify if TLS encryption is enabled
    Check the server and client configuration settings for TLS/SSL enablement status, or inspect the protocol used in the connection URL or handshake
    Affected if TLS encryption is disabled or not configured for Ultra Light Client communications
  4. Inspect network traffic for zlib-compressed data over HTTP
    Use a network sniffer or packet capture tool to observe outgoing traffic from the Ultra Light Client, looking for zlib-compressed data transmitted over unencrypted HTTP connections
    Affected if zlib-compressed data is observed traveling over unencrypted HTTP channels

The environment is affected if the NAVIS N4 Ultra Light Client is transmitting zlib-compressed data over unencrypted HTTP rather than TLS-protected HTTPS connections

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Enable TLS encryption (HTTPS) for all communication between Ultra Light Clients and N4 servers to protect data in transit.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation16.0 h
  • Testing8.0 h
  • Review / QA4.0 h
32.0 hours of engineering $5,600
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-5087 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data