Apple Releases Rapid Security Response Updates for iOS 16.5.1 and macOS 13.4.1 to Fix Actively Exploited Vulnerability [Updated] - MacRumors
Skip to Content

Apple Releases Rapid Security Response Updates for iOS 16.5.1 and macOS 13.4.1 to Fix Actively Exploited Vulnerability [Updated]

Apple today released Rapid Security Response (RSR) updates that are available for iPhone and iPad users running the iOS and iPadOS 16.5.1 updates and the macOS Ventura 13.4.1 update.

Rapid Security Response Feature 1
Rapid Security Response updates are designed to provide iOS and macOS users with security fixes without the need to install a full software update. Today's updates address an actively exploited WebKit vulnerability, so it is a good idea to update as soon as possible.

iOS Security Response 16.5.1 is available through the standard Software Update mechanism in the iPhone or ‌iPad‌ Settings app, but is a quick update, requiring just a couple of minutes to download the update and then a quick restart for the install process. The macOS update can be installed through System Settings.

Once the Rapid Security Response update is installed, iOS 16.5.1 users and macOS Ventura 13.4.1 users will see an updated version of the software, and tapping on the version in the About section of Settings will display information about the installed OS version and the Rapid Security Response update. Those who want to disable Rapid Security Response updates on iPhone can do so by following our how to. The updates can also be disabled on the Mac.

Apple has been testing the Rapid Security Response feature since last year, with RSRs first introduced with the launch of iOS 16 and macOS Ventura.

Update: Apple has pulled the RSRs because they caused a bug with Safari.

Popular Stories

Apple Event Logo

Apple's Next Era Begins September 1

Thursday May 7, 2026 10:36 am PDT by
Apple recently announced that Tim Cook will be stepping down as CEO later this year, after 15 years of leading the company. Effective September 1, Apple's hardware engineering chief John Ternus will become the company's next CEO, while Cook will become executive chairman of Apple's board of directors. In his new role, Apple said Cook will assist with "certain aspects" of the company,...
Four iPhone 18 Pro Colors Mock Feature

iPhone 18 Pro Launching in September With These 10 New Features

Saturday May 9, 2026 6:03 am PDT by
While the iPhone 18 Pro and iPhone 18 Pro Max are not launching until September, there are already plenty of rumors about the devices. It was initially reported that the iPhone 18 Pro models would have fully under-screen Face ID, with only a front camera visible in the top-left corner of the screen. However, the latest rumors indicate that only one Face ID component will be moved under the...
Apple Watch Series 10 Jet Black Touch ID

Apple Watch Series 12 and watchOS 27: What to Expect Later This Year

Friday May 8, 2026 2:07 pm PDT by
While not too much has been reported about the next Apple Watch models, there are a few rumors about potential design changes and watchOS 27 features. Apple Watch Series 12 and Apple Watch Ultra 4 models are expected to be released in September, and we have outlined some of the key rumored hardware and software changes below. A new Apple Watch SE is not expected this year, as that model was...

Top Rated Comments

37 months ago
Breaking Facebook is one of the best security fixes you can get. As an additional benefit your privacy is also significantly enhanced.
Score: 48 Votes (Like | Disagree)
37 months ago

This is good, but Apple need to work on a way for RSRs to NOT require a restart if possible. Even better would be automatic background installation with no restart, or a restart scheduled for the middle of the night (e.g., 3 AM). Having to chase people to get them to update their phones is a real drag.
That's not possible as some security updates impact programs that are loaded in memory. A restart makes sure that the system loads the proper version in memory.
Score: 27 Votes (Like | Disagree)
JPack Avatar
37 months ago
Only 2.8MB, talk about compact! Installation took only about 30 seconds plus a restart. This is what it should have been like a long time ago.
Score: 23 Votes (Like | Disagree)
jbachandouris Avatar
37 months ago
And now Facebook is giving me an unsupported browser error. Was working fine before.

Disabled extensions and ran Onyx to clean things out. No change.
Score: 20 Votes (Like | Disagree)
FishyFish Avatar
37 months ago
Yup this breaks Facebook. Maybe that's the security fix?

Also breaks Instagram.

Also breaks Zoom.

Attachment Image

Attachment Image
Score: 19 Votes (Like | Disagree)
clayj Avatar
37 months ago
This is good, but Apple need to work on a way for RSRs to NOT require a restart if possible. Even better would be automatic background installation with no restart, or a restart scheduled for the middle of the night (e.g., 3 AM). Having to chase people to get them to update their phones is a real drag.
Score: 14 Votes (Like | Disagree)