[badpun]

> But what unpatched security flaws have been reported in older versions of iOS that would allow an attacker to install a keylogger or otherwise exfiltrate user data?

I don't follow the field of iOS security. I only know that, like everyone whose computing devices handle sensitive data and/or money, I want my system to be patched ASAP if a vulnerability is detected. AFAIK, Apple makes no such guarantees.

[scarface74]

The alternative is Android that has a much weaker security model and where the manufacturers don’t offer patches for more than two years if at all.

But as far as iOS, I am not aware of any unpatched security vulnerabilities that have been reported in over ten years that would allow an app to exfiltrate sensitive data from another app on a none jailbroken device.