{"uuid": "73ac6e01-ef61-415a-b4cd-288dd0678302", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-21404", "type": "seen", "source": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-155-01", "content": "View CSAF\n\nSummary\n\nSuccessful exploitation of this vulnerability could allow a local attacker to gain unauthorized access to SOAP methods, resulting in a disruption of operations.\n\nThe following versions of NAVTOR NavBox are affected:\n\n\n\nNavBox 4.16.1.20 (CVE-2026-21404)\n\n<div class=\"csaf-table\">\n\n\n\n\nCVSS\nVendor\nEquipment\nVulnerabilities\n\n\n\n\nv3 6.3\nNAVTOR\nNAVTOR NavBox\nUse of Hard-coded Credentials\n\n\n\n</div>\n\nBackground\n\n\n\nCritical Infrastructure Sectors: Information Technology\n\nCountries/Areas Deployed: Worldwide\n\nCompany Headquarters Location: Norway\n\n\n\n\nVulnerabilities\n<div class=\"csaf-accordion\">\n\nExpand All +\n<div class=\"csaf-accordion-item\">\n\nCVE-2026-21404\n<div class=\"csaf-accordion-content\">\n\nNAVTOR 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.\n\nView CVE Details\n\n\n\nAffected Products\n\nNAVTOR NavBox\n<div class=\"ics-vendor-version-status\">\n<div class=\"ics-vendor\">Vendor:NAVTOR</div>\n<div class=\"ics-version\">Product Version:NAVTOR NavBox: 4.16.1.20</div>\n<div class=\"ics-status\">Product Status:known_affected</div>\n</div>\n<div class=\"ics-remediations\">\n\nRemediations\n\nVendor fixNAVTOR has released a patch for NavBox in April 2026. Version 4.17.2.6 and later includes the fix. Users that have an active NavBox connection will automatically be kept up to date with the latest version. No user action required.\n</div>\n\nRelevant CWE: CWE-798 Use of Hard-coded Credentials\n\n\n\nMetrics\n<div class=\"csaf-table csaf-metrics-table\">\n\n\n\n\nCVSS Version\nBase Score\nBase Severity\nVector String\n\n\n\n\n3.1\n6.3\nMEDIUM\nCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H\n\n\n4.0\n5.8\nMEDIUM\nCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N\n\n\n\n</div>\n</div>\n</div>\n</div>\n\n\n\nAcknowledgments\n\n\n\nCydome Security Ltd reported this vulnerability to CISA\n\n\n\n\nLegal Notice and Terms of Use\n\nThis product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).\n\n\n\nRecommended Practices\n\nCISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability.\n\nMinimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.\n\nLocate control system networks and remote devices behind firewalls and isolating them from business networks.\n\nWhen remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.\n\nCISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.\n\nCISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.\n\nCISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.\n\nAdditional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.\n\nOrganizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.\n\nCISA also recommends users take the following measures to protect themselves from social engineering attacks:\n\nDo not click web links or open attachments in unsolicited email messages.\n\nRefer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.\n\nRefer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.\n\nNo known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. This vulnerability is not exploitable remotely. This vulnerability has a high attack complexity.\n\n\n\nRevision History\n\n\n\nInitial Release Date: 2026-06-04\n\n\n\n\n\nDate\nRevision\nSummary\n\n\n\n\n2026-06-04\n1\nInitial Publication\n\n\n\n\n\n\nLegal Notice and Terms of Use", "creation_timestamp": "2026-06-04T10:00:00.000000Z"}