Several cable modems used by ISPs to provide broadband into homes have a critical vulnerability in their underlying architecture that could give a hacker full remote control of the device. Hundreds of millions of cable modems are affected worldwide.
The vulnerabilities can give hackers full remote control over the entire unit, and all the traffic that flows through it, while being invisible to both the user and ISP. Hackersrs could intercept private messages, redirect traffic, add the modems to botnets, replace their firmware and more. They could also direct the modem to ignore remote system updates, which could complicate any patching process.