This update is for all iPhones since the iPhone 8 up to the present iPhone 14 series. You should update immediately.
Translated into English: some bad guys figured out how to disable your iPhone through a “maliciously crafted email message,” which means that someone found a way to mess up your iPhone by sending an email message that triggered your iPhone into wasting time on nonsense, and not doing what you wanted. A “denial-of-service attack” is a type of computer device attack that basically has your computer, or phone in this case, stop doing useful things as the computer is constantly distracted into doing useless things. It is the equivalent of someone coming and ringing your doorbell all the time, forcing you to check the door and — there isn’t anyone there.
Update immediately. And if you have an iPhone 8 or later and are not running iOS 16, you should do so immediately.
Apple’s update notice:
APPLE-SA-2022-10-10-1 iOS 16.0.3
iOS 16.0.3 addresses the following issues.
Information about the security content is also available at
https://support.apple.com/HT213480.
Mail
Available for: iPhone 8 and later
Impact: Processing a maliciously crafted email message may lead to a
denial-of-service
Description: An input validation issue was addressed with improved
input validation.
CVE-2022-22658
This update is available through iTunes and Software Update on your
iOS device, and will not appear in your computer's Software Update
application, or in the Apple Downloads site. Make sure you have an
Internet connection and have installed the latest version of iTunes
from https://www.apple.com/itunes/ iTunes and Software Update on the
device will automatically check Apple's update server on its weekly
schedule. When an update is detected, it is downloaded and the option
to be installed is presented to the user when the iOS device is
docked. We recommend applying the update immediately if possible.
Selecting Don't Install will present the option the next time you
connect your iOS device. The automatic update process may take up to
a week depending on the day that iTunes or the device checks for
updates. You may manually obtain the update via the Check for Updates
button within iTunes, or the Software Update on your device. To
check that the iPhone, iPod touch, or iPad has been updated: *
Navigate to Settings * Select General * Select About. The version
after applying this update will be "iOS 16.0.3".
All information is also posted on the Apple Security Updates
web site: https://support.apple.com/en-us/HT201222.