Vulnerability in Navtor Navbox
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.001 (1.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000
Affected products
- Navtor Navbox — versions 0, 4.17.2.6
- Navtor Navbox Firmware
Weakness classification (CWE)
References
- github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-155-01.js… (Third Party Advisory)
- www.cisa.gov/news-events/ics-advisories/icsa-26-155-01 (US Government Resource, Mitigation)
Frequently asked questions
- What is CVE-2026-21404?
- CVE-2026-21404 is a medium-severity vulnerability in Navtor Navbox, classified under Use of Hard-coded Credentials. CVSS score: 6.3/10. Published 2026-06-04.
- How severe is CVE-2026-21404?
- Medium severity. CVSS v3 base score is 6.3 out of 10.