How severe is CVE-2026-21404?

CVE-2026-21404 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-21404 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21404?

CVE-2026-21404 affects Navtor Navbox Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21404?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-21404 have an EU (EUVD) identifier?

Yes. CVE-2026-21404 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34321.

When was CVE-2026-21404 published?

CVE-2026-21404 was published on 2026-06-04 and last updated on 2026-07-22.

CVE-2026-21404

CVE-2026-21404 is a medium-severity vulnerability in Navtor Navbox Firmware with a CVSS 3.x base score of 6.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-798.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
CVSS v4: 5.8
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34321
Weakness: CWE-798
Affected product: Navtor Navbox Firmware
Published: 2026-06-04
Last modified: 2026-07-22

Description

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.

Frequently asked questions

What is CVE-2026-21404?: 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.
How severe is CVE-2026-21404?: CVE-2026-21404 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-21404 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21404?: CVE-2026-21404 affects Navtor Navbox Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21404?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21404 have an EU (EUVD) identifier?: Yes. CVE-2026-21404 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34321.
When was CVE-2026-21404 published?: CVE-2026-21404 was published on 2026-06-04 and last updated on 2026-07-22.

References

Affected products (1)

cpe:2.3:o:navtor:navbox_firmware:*:*:*:*:*:*:*:*

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