A maintenance worker has inadvertently infected 55 Victorian red-light and speed cameras with a virus, with the Road Safety Camera Commissioner now investigating the attack.
Commission John Voyage said it was likely a camera tester had breached protocols by inserting an infected USB into the individual computers of the cameras earlier this month.
Authorities detected the virus last week after noticing the cameras rebooting themselves more often than usual.
"It might well be that a number of protocols in place were breached and the USB that may have been used breached protocols," Mr Voyage told AAP on Thursday.
He understood the virus tried to connect to the internet to encrypt the system - but the cameras are not linked to the web.
"I need to find out how the cameras got infected. I need to see if there is a corruption of data of if there is a long-term impact on the system," Mr Voyage said.
"I am confident that there are not any inappropriate infringements issued."
A Justice Department spokesman confirmed the contractor had mistakenly introduced the virus.
"There is no evidence that this was the result of a cyber attack. It occurred as a result of human error," he said.
Victorian Sheriff Brendan Facey says no infringement notices during the period in question will be issued until the Road Safety Camera Commissioner has finished his investigation.
A system patch to prevent the virus from spreading further has been applied to the network of cameras.
The cameras have remained operational because the system was able to reboot itself after detecting the malware.
Mr Voyage will hand his report to Police Minister Lisa Neville.
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