Security researchers have discovered a Wi-Fi network vulnerability said to allow attackers to steal sensitive information or spread malicious software while someone is logged into a computer or mobile device.
One report said the breach could happen only if an attacker is within range of the potential victim, but other observers say the weakness could affect anyone using a Wi-Fi network, whether at home, the office or at a coffee shop or bar.
The problem can potentially affects WPA2, a protocol used to secure Wi-Fi networks.
Major platform providers have started deploying patches in a bid to overcome the problem before it spreads.