Wikileaks has released more CIA spying information as part of their Vault7 series, which earlier included the CIA hack that was used by the EternalBlue group to create the WannaCry pandemic.
According to the recent leak, 25 models of routers, including Linsys and DLinks, can be controlled by the CIA. It is suspected that small modifications would allow the tech to take control of 100 more models, too.
It's called CherryBlossom. It turns the router into a tool the CIA can use to monitor and manipulate all traffic, as well as infect all connected devices with malware (plant their own programs on computers to do what they want with them).
The documents leaked by Wikileaks date to 2007.