Yesterday, Apple released the iOS 15.3.1 and iPad OS 15.3.1 updates, because it is the official version, so users can directly open the settings - universal - software update, can be directly updated. According to Apple's official update instructions, although there are no major new features, the official recommends that users upgrade as soon as possible, because many important bugs have been fixed. The updated version number is: 19D52.
According to Apple's release notes, iOS 15.3.1 and iPad OS 15.3.1 fix an issue that could cause braille display to stop responding.
According to Apple, the iOS 15.3.1 and iPad OS 15.3.1 updates also provide important security fixes for the iPhone and iPad. Apple's accompanying security support document explains that the software resolves a WebKit vulnerability that could allow maliciously crafted web content to cause arbitrary code execution.
It is worth noting that the size of the OTA update package is 247.9M, iOS 15.3.1 is suitable for: iPhone 6s and later, iPad OS 15.3.1 is available for iPad Pro (all models), iPad Air 2 and later, iPad fifth generation and higher, iPad mini 4 and higher, and iPod touch (seventh generation).
Apple said it was aware of reports that the vulnerability could have been actively exploited, so iPhone and iPad users must update to the new iOS 15.3.1 and iPad OS 15.3.1 as soon as possible.