CVE-2026-21404: NAVTOR NavBox through version 4.16.1.20 contains hard-coded credentials within its Windows Communication Found

Q: How do I fix CVE-2026-21404?

navbox firmware: upgrade to newer than 4.16.1.20. Exact commands for each OS are on this page.

Q: Is CVE-2026-21404 being exploited?

CVE-2026-21404 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-21404 affect?

CVE-2026-21404 affects navbox firmware. Severity is medium (CVSS 6.3). NAVTOR 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

Q: How urgent is CVE-2026-21404?

Priority 23/100. No elevated risk signals yet.

Routine

MEDIUM 6.3UPGRADE

CVE-2026-21404 is a medium-severity flaw (CVSS 6.3) affecting navbox firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NAVTOR 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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 98%)
CISA exploited list	No
Weakness	CWE-798
Published	2026-06-04
Last modified	2026-07-22

Publisher (CNA): ICS-CERT · Vendor: navtor

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-04 20:16 UTCPublished CVE record published
2026-07-22 20:10 UTCUpdated Record last modified

navtor navbox firmware UPGRADE

Affected: <= 4.16.1.20

Fixed in: newer than 4.16.1.20

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-21404?

navbox firmware: upgrade to newer than 4.16.1.20. Exact commands for each OS are on this page.

Is CVE-2026-21404 being exploited?

CVE-2026-21404 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-21404 affect?

CVE-2026-21404 affects navbox firmware. Severity is medium (CVSS 6.3). NAVTOR 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

How urgent is CVE-2026-21404?

Priority 23/100. No elevated risk signals yet.

Software pages

Windows vulnerabilities

References

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