CVE-2026-21404

Local file overwrite via hard-coded SOAP credentials

Published Jun 4, 2026 · Updated Jun 4, 2026

Hard-coded credentials in NAVTOR NavBox 4.16.1.20 and earlier allow local users to access privileged SOAP methods and write files. The Windows Communication Foundation implementation embeds credentials that can be extracted and accepted by the SOAP interface, bypassing the intended transfer workflow. SOAP functionality must be enabled, and low-privilege local access is required; authenticated callers can write or overwrite files only within application-defined paths.

CVSS severity6.3
Medium
EPSS probability0.12%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in NAVTOR NavBox 4.16.1.20 and earlier allow local users to access privileged SOAP methods and write files. The Windows Communication Foundation implementation embeds credentials that can be extracted and accepted by the SOAP interface, bypassing the intended transfer workflow. SOAP functionality must be enabled, and low-privilege local access is required; authenticated callers can write or overwrite files only within application-defined paths.

The record

CVE
CVE-2026-21404
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
NAVTOR
Product
NavBox
Classifications
CWE-798, T1078, T1552.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=4.16.1.20

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

NAVTOR · NavBoxversion=0 <=4.16.1.20

Published CVSS scores

6.3ICS-CERTCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
5.8ICS-CERTCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1078Valid Accounts
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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