What was the security flaw in WhatsApp that NSO exploited?

Vulnerabilities like BroadAnywhere and StageFright were identified and fixed a few years back, and any self-respecting company would have taken note of that and examined their software for similar bugs. So I’m not very convinced that WhatsApp’s so-called zero day exploit was something unknown to the company.

What was the security flaw? Was it similar to StageFright, where an underflow/overflow allowed malware to be injected? Could it have been an intentional backdoor introduced by the parent company to read messages (like how they stored passwords in plaintext), and NSO (or any random hacker) got wind of it?

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Agregar botones de whatsapp en android

quisiera agregar botones similares a estos dentro de mi app, actualmente tengo un boton que realiza esta opcion.

    public void whatsapp(String phone){         Uri uri = Uri.parse("https://api.whatsapp.com/send?phone=" + phone);        Intent intent = new Intent(Intent.ACTION_VIEW, uri);        context.startActivity(intent);      } 

Pero necesito agregar estos tipos de botones.

Captura de la app “truecaller”

Estos botones quiero agregar a mi app, Imagen de la app Truecaller