According to the release notes, the update fixes a security flaw that may have been exploited by hackers. Describing its impact, Apple noted “Processing web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.”
In general, it is advisable for users to keep their iPhones updated to the latest OS version. However, when it comes to a Rapid Security Response update, users should urgently update their devices as hackers and bad actors may end up accessing their personal data.
What is Rapid Security Response
According to Apple’s support page, Rapid Security Response (RSR) is a mechanism for applying security fixes to users more frequently by not requiring a full software update. These responses are included in any ensuing minor update (not upgrade) and, on a Mac, applied content appears on the Preboot volume (through symbolic links in /System/Cryptexes/).
Rapid Security Responses that involve the operating system require the device to restart. These updates are available for iPad, iPhone and Mac. For example, In macOS, the applied operating system content may be made available to Safari and its associated processes with just a relaunch of those processes, though a restart is required to make this content widely available to the rest of the operating system.
“Rapid Security Responses also don’t adhere to the managed software update delay; however, because they apply only to the latest minor operating system version, if that minor operating system update is delayed, the response is also effectively delayed. If necessary, the user can also remove the responses,” notes Apple on the support page.
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