Immunet was a free, cloud-based, community-driven antivirus application, using the ClamAV and its own engine.

[5] Immunet was previously provided by Sourcefire in two editions, Free (for personal use),[6][7][8] and Plus (for commercial use).

Immunet advises that the free version be used alongside another antivirus program, and supports several particular such programs in the sense that they co-install properly and work in tandem during normal operations without any obvious interference or resource drag.

[12] Immunet's virus definitions are stored on servers available over the Internet, requiring less memory and system resource than antivirus programs that reside on the user's computer.

According to its main website, Cisco aims to continue contributing to cybersecurity through Talos threat intelligence, but Immunet does not fit this purpose.