Watering-hole attacks executed by experts exploited Chrome, Windows and Android flaws and were carried out on two servers. Google researchers have detailed a major hacking campaign that was detected in early 2020. The exploits used against Windows included zero-day flaws, while Android users were targeted with exploit chains using known n-day exploits. The attacks were performed by a highly sophisticated actor, researchers from Google Project Zero and the Google Threat Analysis Group said.
Source: https://threatpost.com/hacks-android-windows-zero-day/163007/