BIMCO Cyber Security Guidelines for Shipping Explained

Overview: What Are the BIMCO Guidelines?

BIMCO (Baltic and International Maritime Council) is the largest international shipping association. Its Guidelines on Cyber Security Onboard Ships, co-produced with most of the major shipowner and operator associations (ICS, INTERCARGO, INTERTANKO, OCIMF, IUMI, WSC, IAPH and others), are the most widely adopted industry interpretation of the IMO maritime cyber risk management requirement.

The Guidelines do not have the force of regulation. They are a recommended-practice document. In practice, however, they have become the de facto reference for flag state inspectors, class society auditors, P&I clubs and charterers when evaluating a shipping company's cyber posture. A company that can demonstrate alignment to BIMCO Guidelines is generally treated as having met the IMO 2021 expectation.

The current edition is the 4th edition (released 2021, with periodic updates). It runs to roughly 100 pages and covers risk assessment methodology, technical controls, operational controls, third-party management, response and recovery, and contingency planning.

Risk Assessment Framework

The risk assessment is the heart of the programme. It is also where most shipping companies stumble, either by skipping it entirely (running straight to controls) or by treating it as a one-time document rather than a living artefact. BIMCO recommends annual review, plus an unscheduled review whenever a significant change occurs (new vessel, major refit, new vendor with system access, significant cyber incident in the industry that may shift the threat picture).

• Identify threats (deliberate attack, untargeted malware, supplier compromise, insider, error and omission)
• Identify vulnerabilities (technical, procedural, people)
• Assess risk exposure (likelihood times impact)
• Develop protection and detection measures (controls)
• Establish contingency plans (response and recovery)
• Respond and recover from incidents (lessons learned, programme update)

People and Process Controls

BIMCO is explicit that people and process controls deliver substantial risk reduction at lower cost than technology controls. The Guidelines spend significant space on training, role definition, change management, vendor management, and documentation, before discussing firewalls and segmentation.

Recommended people controls: cyber familiarisation at induction for all sea staff, role-specific training for master, chief officer, chief engineer and ETOs (electro-technical officers), refresher training annually, and culture-building that makes reporting safe (no blame for the crew member who plugs in a problematic USB stick if they report it).

Recommended process controls: documented operating procedures for USB media, software updates, vendor remote access, account creation and removal, network configuration changes, and incident reporting. Each should be referenced from the SMS so the auditor can verify integration. Change management is particularly important: a cyber-clean vessel today can become exposed tomorrow if an unsupervised vendor connects new equipment without going through the change process.

Technology Controls

Technology controls in BIMCO are framed around defence in depth. The recommended layers include network segmentation between vessel IT, vessel OT, crew and satcom; firewall enforcement at the segmentation boundaries; endpoint protection on vessel IT systems where supported by the vendor; vulnerability and patch management on supported systems with a documented exception process for systems that cannot be patched; account management including separate accounts per crew member, role-based access, and removal on crew change; logging and monitoring sufficient to support incident response; and physical controls on USB ports, removable media, and equipment access.

BIMCO does not prescribe specific vendors or specific products. The Guidelines are technology-neutral. This is helpful because it allows each shipowner to apply controls consistent with their fleet age, equipment vendors, and operational model. The flip side is that a company adopting BIMCO must do the interpretation work to translate the principles into specific deployed configurations. Codesecure helps clients do this translation as part of our BIMCO gap closure engagements.

Third-Party and Supplier Risk

A meaningful section of BIMCO is dedicated to third-party and supplier cyber risk, recognising that vessel cyber posture is heavily dependent on the assurance practices of the vendors who supply chart updates, software patches, remote diagnostics, planned maintenance, satcom services, and shore-integrated platforms.

Recommended actions: maintain a register of all third parties with access to vessel or shore systems, classify each by risk (full network access > read-only telemetry access > one-time installation > no access), include cyber clauses in service agreements (vulnerability notification, incident reporting, security control attestation), require evidence of vendor cyber posture (ISO 27001 certificate, SOC 2 report, BIMCO self-attestation, or equivalent), and review vendor cyber posture at the same cadence as commercial review.

Particular attention is recommended for satcom vendors (because the satcom path is the dominant remote-access route to vessels) and for chart vendors (because chart updates are safety-critical and any tampering propagates fleet-wide).

Crew Awareness and Reporting Culture

BIMCO emphasises culture. A vessel cyber programme that punishes crew for reporting incidents will not get reports, which means the company will learn about incidents only when they become unmissable. The Guidelines recommend a no-blame, prompt-recognition culture where reporting is treated as a positive action even when the underlying issue was a crew mistake.

Practical actions: include reporting channels and tone in the cyber familiarisation training, celebrate reports in company newsletters or fleet briefings (anonymised where appropriate), and ensure the master can articulate that 'speak up' is the expectation. Many shipowners run a quarterly 'cyber moment' at the safety meeting, similar to the safety moment, to keep cyber visible without it becoming a separate, ignorable agenda item.

Using BIMCO for a Gap Assessment

The most efficient way to apply BIMCO is as a gap assessment framework. Walk the Guidelines section by section, compare current state to recommended state per control area, record the gap, and build a remediation roadmap with severity-based prioritisation.

A typical Codesecure BIMCO gap assessment for a mid-size fleet runs 4 to 6 weeks. It includes a one-day workshop with the DPA and HSE leads, a vessel walkthrough on a representative vessel per class, document review of SMS, training records and vendor registers, and a written report that maps current state, gaps, and a 90 / 180 / 360 day remediation roadmap. The output is then used to update the SMS, drive procurement of any required tools, and structure crew training for the following year. The same document satisfies flag state audit preparation and P&I renewal questionnaires.