"Advanced cyber actor" took advantage of vulnerability allowing malware to penetrate phones using the app's voice calling function

Synopsis

In May 2019, the company warned its users that a vulnerability in its service could have left its 1.5 billion users exposed to hackers. Attackers placed malicious code on users' devices simply by making a call. The malware spread to 1,400 mobile phones. It fixed the vulnerability and requested all users install an update to their app to be safe.

In October 2019 it was announced that their parent company is taking the spyware vendor to court over allegations that the firm helped to deploy malware that was used to target their users.

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