There were, eg in Outlook: https://msrc.microsoft.com/update-guide/vulnerability...

		wffurr on Sept 8, 2023 \| parent \| context \| favorite \| on: NSO group iPhone zero-click, zero-day exploit capt... There were, eg in Outlook: https://msrc.microsoft.com/update-guide/vulnerability/CVE-20... There probably still are and it’s possibly some three letter agencies or bad actors know about them.