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ATLANTA — Defending against cyberattacks is often a matter of returning to the basics, according to Justin Turner, director of the counterthreat unit special operations team at SecureWorks.

The cyberattack that befell FedEx Corp.’s TNT Express unit earlier this summer highlights an ever-increasing risk that many trucking fleets are up against — and which may not be insured under the typical coverages they carry, insurance industry experts say.

A.P. Moller-Maersk A/S said a cyberattack that hit the owner of the world’s biggest container shipping company at the end of June will wipe as much as $300 million off profits in the third quarter.

FedEx Corp. said information systems at its TNT delivery unit may not fully recover from a June cyberattack, reiterating that the incident will hit the company’s financial results.

A global cyberattack that hit shipping behemoth A.P. Moller-Maersk is creating enormous stress at the APM Terminal in Elizabeth, N.J.

Some dry cargo delivery at PortMiami has come to a halt this week after a cyber attack hit a company that operates in one of the terminals.

As commercial trucks become increasingly connected to the internet, concerns about vehicle cybersecurity are growing, particularly with the trucking industry continuing its push toward more advanced automated driving systems.