Virgin Media is encouraging clients with a particular broadband router to modify their passwords due to a hacking threat.
The firm said that those with a Super Hub 2 router need to change both their system and router passwords if they are currently using the default password which is exposed on the device.
The advice was announced after an investigation by Which?, who found that hackers could get access to home systems on this router.
Virgin Media said that the number of customers with this router is over 800,000 people.
A spokesman told the BBC: The security of our network and of our customers if of paramount importance to us. We continually upgrade our systems and equipment to ensure that we meet all current industry standards.
‘We regularly support our customers through advice and updates and offer them the chance to upgrade to a Hub 3.0 which contains additional security provisions.’