Explained: WhatsApp’s case vs Israeli spyware firm NSO, and how attack happened

WhatsApp claims it detected the attack in May 2019 and found that NSO exploited a “buffer overflow vulnerability in WhatsApp VOIP stack” to send its Pegasus malware to the target devices, even without the users answering the calls they received.

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WhatsApp has roped in cyber security experts at the Citizen Lab, an academic research group based at the University of Toronto’s Munk School, to learn more about the attack.

WhatsApp, which prides itself on its encrypted messaging capabilities, has filed a complaint in a California court accusing spyware company NSO Group and its parent company Q Cyber Technologies of targeting at least 1,400 users across the world.