Update immediately iPhone your. Apple released iOS 14.4 update with fixes to three critical security gaps which are probably known.
Apple did not provide too many details about the bugs, except that "they may have already been used."
One vulnerability even affects the kernel, and an attacker could elevate his privilege level (such as becoming an administrator) to cause severe damage on your device or steal your data.
The two other vulnerabilities affect Apple's WebKit rendering engine that powers the Safari. They allow attackers to run wild code that could be used to track you. We don't know if this can be done remotely or if the attacker needs physical access to the device.
Over time, we may learn more about these security holes, but for now it's important to update your iPhone to iOS 14.4 right away.
To do this, follow the path Settings - General - Software Update and download the update.