MacGregor Voyage Data Recorder (VDR) G4e

Summary

A CISA advisory discloses five vulnerabilities in the Danelec MacGregor Voyage Data Recorder (VDR) G4e, a maritime navigation device deployed globally. The flaws include default credentials with no enforced change, hard-coded accounts, weak password hashing, and improper file access controls—collectively enabling unauthenticated attackers to gain administrator access. Danelec has released firmware V5.250 as a fix; CISA recommends immediate patching and network isolation for these critical infrastructure devices.

Full text

ICS Advisory MacGregor Voyage Data Recorder (VDR) G4e Release DateMay 28, 2026 Alert CodeICSA-26-148-01 Related topics: Industrial Control System Vulnerabilities, Industrial Control Systems View CSAF Summary Successful exploitation of these vulnerabilities could result in an attacker gaining administrator access to the device. The following versions of MacGregor Voyage Data Recorder (VDR) G4e are affected: MacGregor Voyage Data Recorder (VDR) G4e <V5.250 CVSS Vendor Equipment Vulnerabilities v3 8.3 Danelec MacGregor Voyage Data Recorder (VDR) G4e Use of Default Credentials, Insufficiently Protected Credentials, Use of Password Hash With Insufficient Computational Effort, Use of Hard-coded Credentials, Files or Directories Accessible to External Parties Background Critical Infrastructure Sectors: Transportation Systems Countries/Areas Deployed: Worldwide Company Headquarters Location: Denmark Vulnerabilities Expand All + CVE-2026-42941 The VDR device includes a default username and password, with no enforced password change. View CVE Details Affected Products MacGregor Voyage Data Recorder (VDR) G4e Vendor:Danelec Product Version:Danelec MacGregor Voyage Data Recorder (VDR) G4e: <V5.250 Product Status:known_affected Remediations Vendor fixDanelec has released firmware version V5.250 to resolve these vulnerabilities. Users of MacGregor Voyage Data Recorder (VDR) G4e devices are encouraged to update the firmware at the earliest service attendance rather than waiting for an annual performance test. Contact Danelec with additional questions: https://www.danelec.com/contacthttps://www.danelec.com/contact Relevant CWE: CWE-1392 Use of Default Credentials Metrics CVSS Version Base Score Base Severity Vector String 3.1 8.3 HIGH CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L 4.0 8.7 HIGH CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N CVE-2026-42951 An authenticated user can download a backup of the device which includes account data and password hashes. View CVE Details Affected Products MacGregor Voyage Data Recorder (VDR) G4e Vendor:Danelec Product Version:Danelec MacGregor Voyage Data Recorder (VDR) G4e: <V5.250 Product Status:known_affected Remediations Vendor fixDanelec has released firmware version V5.250 to resolve these vulnerabilities. Users of MacGregor Voyage Data Recorder (VDR) G4e devices are encouraged to update the firmware at the earliest service attendance rather than waiting for an annual performance test. Contact Danelec with additional questions: https://www.danelec.com/contacthttps://www.danelec.com/contact Relevant CWE: CWE-522 Insufficiently Protected Credentials Metrics CVSS Version Base Score Base Severity Vector String 3.1 5.4 MEDIUM CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N 4.0 5.9 MEDIUM CVSS:4.0/AV:A/AC:H/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N CVE-2026-44611 Passwords are stored with a hashing method which limits password length and is susceptible to brute force attacks. View CVE Details Affected Products MacGregor Voyage Data Recorder (VDR) G4e Vendor:Danelec Product Version:Danelec MacGregor Voyage Data Recorder (VDR) G4e: <V5.250 Product Status:known_affected Remediations Vendor fixDanelec has released firmware version V5.250 to resolve these vulnerabilities. Users of MacGregor Voyage Data Recorder (VDR) G4e devices are encouraged to update the firmware at the earliest service attendance rather than waiting for an annual performance test. Contact Danelec with additional questions: https://www.danelec.com/contacthttps://www.danelec.com/contact Relevant CWE: CWE-916 Use of Password Hash With Insufficient Computational Effort Metrics CVSS Version Base Score Base Severity Vector String 3.1 5.4 MEDIUM CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N 4.0 5.9 MEDIUM CVSS:4.0/AV:A/AC:H/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N CVE-2026-42929 The device includes default accounts with hard-coded credentials. View CVE Details Affected Products MacGregor Voyage Data Recorder (VDR) G4e Vendor:Danelec Product Version:Danelec MacGregor Voyage Data Recorder (VDR) G4e: <V5.250 Product Status:known_affected Remediations Vendor fixDanelec has released firmware version V5.250 to resolve these vulnerabilities. Users of MacGregor Voyage Data Recorder (VDR) G4e devices are encouraged to update the firmware at the earliest service attendance rather than waiting for an annual performance test. Contact Danelec with additional questions: https://www.danelec.com/contacthttps://www.danelec.com/contact Relevant CWE: CWE-798 Use of Hard-coded Credentials Metrics CVSS Version Base Score Base Severity Vector String 3.1 8.3 HIGH CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L 4.0 8.7 HIGH CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N CVE-2026-40425 The administrator account for the web interface can directly edit sensitive files related to authentication, potentially changing the root password. View CVE Details Affected Products MacGregor Voyage Data Recorder (VDR) G4e Vendor:Danelec Product Version:Danelec MacGregor Voyage Data Recorder (VDR) G4e: <V5.250 Product Status:known_affected Remediations Vendor fixDanelec has released firmware version V5.250 to resolve these vulnerabilities. Users of MacGregor Voyage Data Recorder (VDR) G4e devices are encouraged to update the firmware at the earliest service attendance rather than waiting for an annual performance test. Contact Danelec with additional questions: https://www.danelec.com/contacthttps://www.danelec.com/contact Relevant CWE: CWE-552 Files or Directories Accessible to External Parties Metrics CVSS Version Base Score Base Severity Vector String 3.1 5.7 MEDIUM CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:L 4.0 6.9 MEDIUM CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N Acknowledgments Andrew Tierney of Pen Test Partners reported these vulnerabilities to 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: 2026-05-28 Date Revision Summary 2026-05-28 1 Initial Publication Legal Notice and Terms of Use This product is provided subject to this Notification and this Privacy & Use policy. Tags Sector: Transport

Indicators of Compromise

• cve — CVE-2026-42941
• cve — CVE-2026-42951
• cve — CVE-2026-44611
• cve — CVE-2026-42929
• cve — CVE-2026-40425

Entities