About 50 Victorian speed and red-light cameras have been hit by a computer virus, but police say the cameras have not been compromised.

The Department of Justice and Regulation confirmed the "WannaCry" virus has hit private camera operator RedFlex, which operates most cameras in the state.

A virus has been detected, but police say speed cameras haven't been compromised. Credit:Adam McLean

It follows the WannaCry ransomware attack in May - believed to be the world's biggest online extortion attempt - which struck more than 100,000 organisations in 150 countries, including British hospitals, German rail operators and Chinese universities.

A Department of Justice and Regulation spokesman said 55 intersection and highway cameras were impacted by the virus which was mistakenly introduced by a contractor.



"There is no evidence that this was the result of a cyber attack," he said. "It occurred as a result of human error."