Dutch researchers from cybersecurity firm Midnight Blue have reported discovering a deliberate hacker’s backdoor in the TETRA radio technology that’s used in 120 countries to control critical infrastructure like power grids, gas pipelines, trains, airports, and communications for emergency services.

The backdoor in the encryption algorithm, could easily be hacked, reportedly in just minutes, and used to disrupt critical infrastructure worldwide with dire consequences. The researchers have warned organisations using radio technologies to check with their manufacturer if their devices use TETRA and what fixes are available. As yet, many critical infrastructure companies are reported to be unresponsive and could still be at serious risk.