CVE-2026-21404
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 · uneditedNAVTOR NavBox through version 4.16.1.20 contains hard-coded credentials within its Windows Communication Foundation (SOAP) implementation. If the SOAP functionality is enabled, a local attacker can extract credentials to bypass the intended transfer workflow. Successful authentication against the SOAP interface grants access to privileged WCF methods, enabling an attacker to write or overwrite files within application-defined paths.
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 · moderate confidenceNAVTOR NavBox through version 4.16.1.20 contains hard-coded credentials embedded in its Windows Communication Foundation (SOAP) implementation. When SOAP functionality is enabled, a local attacker with file system access can extract these credentials and use them to authenticate against the SOAP interface, gaining unauthorized access to privileged WCF methods that allow writing or overwriting files within application-defined paths.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data<= 4.16.1.20CVSS 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
- Local
- Complexity
- High
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
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 checksWork through these to decide whether this CVE applies to you.
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Identify NavBox firmware versionAccess the device management interface or system information panel to retrieve the currently installed NavBox firmware version numberAffected if The installed version is 4.16.1.20 or any lower version (versions through 4.16.1.20 are affected)
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Determine SOAP functionality statusLocate the SOAP or WCF configuration settings within the NavBox administrative interface or configuration files, and verify whether the SOAP service is currently enabledAffected if SOAP functionality is enabled on the device (the vulnerability only applies when SOAP is active)
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Locate SOAP implementation filesInspect the application directories for Windows Communication Foundation (WCF) or SOAP-related configuration and binary files, typically found within the NavBox installation or firmware structureAffected if SOAP/WCF implementation files exist and contain hard-coded credential strings embedded in the code or configuration
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Review WCF method permissionsExamine the WCF service configuration to determine which methods are exposed and whether proper authentication and authorization controls are enforced on file write operationsAffected if WCF methods allow unauthenticated or improperly authorized file write operations to application-defined paths
The environment is affected if the NavBox firmware is version 4.16.1.20 or lower AND SOAP functionality is enabled, allowing exploitation of hard-coded credentials to access privileged file write methods.
Generated from the published advisory. Verify against your own configuration.
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 dataDisable SOAP functionality if not required; otherwise, upgrade to a version that removes hard-coded credentials and implement externalized, secure credential management with unique, rotating credentials for the SOAP interface.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-21404 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-21404 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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