FURUNO FA-50 Class B AIS Transponder

Summary

Two critical vulnerabilities have been identified in the FURUNO FA-50 Class B AIS Transponder, affecting all versions. CVE-2026-59769 allows attackers with network access and credentials to alter device settings, while CVE-2026-67578 enables configuration changes without authentication. As production ceased in October 2020, no software updates will be provided, and users are advised to avoid direct internet connections and secure the vessel's network.

Full text

ICS Advisory FURUNO FA-50 Class B AIS Transponder Release DateAugust 25, 2026 Alert CodeICSA-26-237-07 Related topics: Industrial Control System Vulnerabilities , Industrial Control Systems View CSAF Summary Successful exploitation of these vulnerabilities could allow an attacker to alter device settings. The following versions of FURUNO FA-50 Class B AIS Transponder are affected: FURUNO FA-50 Class B AIS Transponder vers:all/* CVSS Vendor Equipment Vulnerabilities v3 9.1 FURUNO ELECTRIC CO.,LTD. FURUNO FA-50 Class B AIS Transponder Use of Hard-coded Credentials, Missing Authentication for Critical Function Background Critical Infrastructure Sectors: Transportation Systems Countries/Areas Deployed: Worldwide Company Headquarters Location: Japan Vulnerabilities Expand All + CVE-2026-59769 An attacker, who knows the credentials and has access to the in-vessel network to which the device is connected to, may operate the settings screen using that credentials to alter the settings of the device. View CVE Details Affected Products FURUNO FA-50 Class B AIS Transponder Vendor:FURUNO ELECTRIC CO.,LTD. Product Version:FURUNO FA-50 Class B AIS Transponder: vers:all/* Product Status:known_affected Remediations MitigationFURUNO ELECTRIC CO.,LTD. notes that production of this product ended in October 2020, and software updates will no longer be provided. FURUNO recommends users do not connect the product directly to the internet. To prevent unauthorized access, the vessel on which the product is installed should be properly locked and managed. Relevant CWE: CWE-798 Use of Hard-coded Credentials Metrics CVSS Version Base Score Base Severity Vector String 3.1 9.1 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H 4.0 8.8 HIGH CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N CVE-2026-67578 Some configurations may be changed on the management screen without authentication. View CVE Details Affected Products FURUNO FA-50 Class B AIS Transponder Vendor:FURUNO ELECTRIC CO.,LTD. Product Version:FURUNO FA-50 Class B AIS Transponder: vers:all/* Product Status:known_affected Remediations MitigationFURUNO ELECTRIC CO.,LTD. notes that production of this product ended in October 2020, and software updates will no longer be provided. FURUNO recommends users do not connect the product directly to the internet. To prevent unauthorized access, the vessel on which the product is installed should be properly locked and managed. Relevant CWE: CWE-306 Missing Authentication for Critical Function Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N 4.0 8.7 HIGH CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N Acknowledgments Souvik Kandar reported these vulnerabilities to CISA JPCERT/CC coordinated with Furuno Electric and CISA Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When 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. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA 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. CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional 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. Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time. Revision History Initial Release Date: 2026-08-25 Date Revision Summary 2026-08-25 1 Initial Publication Legal Notice and Terms of Use This product is provided subject to this Notification and this Privacy & Use policy. Tags Sector: Transportation Systems Sector Topics: Industrial Control System Vulnerabilities, Industrial Control Systems Please share your thoughts We recently updated our anonymous product survey; we welcome your feedback. Related Advisories Aug 25, 2026 ICS Advisory | ICSA-26-237-02 Zoneminder Aug 25, 2026 ICS Advisory | ICSA-26-237-04 PayRange API Aug 25, 2026 ICS Advisory | ICSA-26-237-03 Siemens SIMATIC IoT2050 Advanced Aug 25, 2026 ICS Advisory | ICSA-26-237-06 Ebyte NE2-D11

Indicators of Compromise

• cve — CVE-2026-59769
• cve — CVE-2026-67578

Entities