Virgin Media has insisted it is working to address security concerns over its SuperHub 3 router.
The device uses an Intel Puma 6 chipset, which has already garnered criticism because of a bug that leads to latency spikes and packet loss, ISPreview.co.uk reports.
However, users of Virgin Media's online forum and the DSL Reports site have also raised concerns that the device could be vulnerable to a low bandwidth Denial of Service (DoS) attack.
This means that if a person is familiar with somebody's Virgin IP address, they could send it so much data that it becomes effectively unusable.
Virgin Media has responded by insisting it takes the security and reliability of its service "very seriously" and has "tools and systems in place on our network to protect our customers.
Speaking to ISPreview.co.uk, a Virgin Media Spokesperson added: "We are currently speaking to our suppliers regarding reports of Puma 6 issues."