Apple Fixed Two Actively Exploited Vulnerabilities in macOS 12.3.1 Monterey, But Hasn't Released Updates for Big Sur or Catalina

With the release of macOS Monterey 12.3.1 on Thursday, March 31, Apple addressed two critical vulnerabilities that may have been actively exploited in the wild, but as Intego pointed out this week, Apple left macOS Big Sur and macOS Catalina users vulnerable.

macOS Big Sur Feature Triad
The macOS Monterey 12.3.1 update fixed a pair of security flaws, including an AppleAVD issue that could allow an application to execute arbitrary code with kernel privileges and an Intel Graphics Driver issue that could allow an application to read kernel memory. Apple said that it was aware of reports that these vulnerabilities "may have been actively exploited," aka there are attacks that use these specific security holes.

Apple often provides security updates for macOS Catalina and macOS Big Sur users alongside macOS Monterey updates to make sure that Mac users who continue to run older operating systems remain protected. Apple has not done so in this case, and there are no security fixes for macOS 11 Big Sur or macOS 10.15 Catalina.

macOS Big Sur and macOS Catalina are still being supported with updates for notable vulnerabilities, so it is not clear why security fixes have not been released. According to Intego, this is the first time that Apple has not released simultaneous security patches for Big Sur and Catalina alongside fixes provided for macOS Monterey.

Big Sur remains vulnerable to CVE-2022-22675 (the AppleAVD bug), while CVE-2022-22674 (an Intel Graphics Driver bug) likely impacts both Big Sur and Catalina, based on research conducted by Intego.

There are some Mac users who choose to remain on Big Sur or Catalina who could install Monterey to get security fixes, but other Mac users have older hardware that is not able to be updated to Monterey, and these users have no way to address the security flaws that are now publicized.

Intego estimates that around 35 percent of Macs in use today could be affected by one or both vulnerabilities, and Apple has not responded to the site's request for an update on when security fixes might come out for Big Sur and Catalina.

Related Forums: macOS Catalina, macOS Big Sur

Popular Stories

iOS 26

iOS 26.2 Coming Soon With These 8 New Features on Your iPhone

Thursday December 11, 2025 8:49 am PST by
Apple seeded the second iOS 26.2 Release Candidate to developers earlier this week, meaning the update will be released to the general public very soon. Apple confirmed iOS 26.2 would be released in December, but it did not provide a specific date. We expect the update to be released by early next week. iOS 26.2 includes a handful of new features and changes on the iPhone, such as a new...
iOS 26

iOS 26.4 and iOS 27 Features Revealed in New Leak

Friday December 12, 2025 10:56 am PST by
Macworld's Filipe Espósito today revealed a handful of features that Apple is allegedly planning for iOS 26.4, iOS 27, and even iOS 28. The report said the features are referenced within the code for a leaked internal build of iOS 26 that is not meant to be seen by the public. However, it appears that Espósito and/or his sources managed to gain access to it, providing us with a sneak peek...
AirPods Pro Firmware Feature

Apple Releases New Firmware for AirPods Pro 2 and AirPods Pro 3

Thursday December 11, 2025 11:28 am PST by
Apple today released new firmware designed for the AirPods Pro 3 and the prior-generation AirPods Pro 2. The AirPods Pro 3 firmware is 8B30, up from 8B25, while the AirPods Pro 2 firmware is 8B28, up from 8B21. There's no word on what's include in the updated firmware, but the AirPods Pro 2 and AirPods Pro 3 are getting expanded support for Live Translation in the European Union in iOS...
iOS 26

Apple Releases iOS 26.2 With Alarms for Reminders, Lock Screen Changes, Enhanced Safety Alerts and More

Friday December 12, 2025 10:10 am PST by
Apple today released iOS 26.2, the second major update to the iOS 26 operating system that came out in September, iOS 26.2 comes a little over a month after iOS 26.1 launched. ‌iOS 26‌.2 is compatible with the ‌iPhone‌ 11 series and later, as well as the second-generation ‌iPhone‌ SE. The new software can be downloaded on eligible iPhones over-the-air by going to Settings >...
Google maps feaure

Google Maps Quietly Added This Long-Overdue Feature for Drivers

Wednesday December 10, 2025 2:52 am PST by
Google Maps on iOS quietly gained a new feature recently that automatically recognizes where you've parked your vehicle and saves the location for you. Announced on LinkedIn by Rio Akasaka, Google Maps' senior product manager, the new feature auto-detects your parked location even if you don't use the parking pin function, saves it for up to 48 hours, and then automatically removes it once...
AirTag 2 Mock Feature

Apple AirTag 2: Four New Features Found in iOS 26 Code

Thursday December 11, 2025 10:31 am PST by
The AirTag 2 will include a handful of new features that will improve tracking capabilities, according to a new report from Macworld. The site says that it was able to access an internal build of iOS 26, which includes references to multiple unreleased products. Here's what's supposedly coming: An improved pairing process, though no details were provided. AirTag pairing is already...
macOS Tahoe 26 Thumb

Apple Releases macOS Tahoe 26.2 With Edge Light

Friday December 12, 2025 10:08 am PST by
Apple today released macOS Tahoe 26.2, the second major update to the macOS Tahoe operating system that came out in September. macOS Tahoe 26.2 comes five weeks after Apple released macOS Tahoe 26.1. Mac users can download the macOS Tahoe update by using the Software Update section of System Settings. macOS Tahoe 26.2 includes Edge Light, a feature that illuminates your face with soft...
iOS 26

15 New Things Your iPhone Can Do in iOS 26.2

Friday December 5, 2025 9:40 am PST by
Apple is about to release iOS 26.2, the second major point update for iPhones since iOS 26 was rolled out in September, and there are at least 15 notable changes and improvements worth checking out. We've rounded them up below. Apple is expected to roll out iOS 26.2 to compatible devices sometime between December 8 and December 16. When the update drops, you can check Apple's servers for the ...

Top Rated Comments

chucker23n1 Avatar
48 months ago

According to Intego, this is the first time that Apple has not released simultaneous patches for Big Sur and Catalina alongside a security update provided for macOS Monterey.
It's not.

Big Sur and Catalina did get theirs on the same day with 12.3:



But they didn't with 12.2.1:




So, it's not unprecedented for there to be a gap of a few days.

Attachment Image

Attachment Image
Score: 20 Votes (Like | Disagree)
KaliYoni Avatar
48 months ago
This is terrible on Apple's part because even Mac users who stay within the last two releases of macOS are, often unknowingly as Intego's research revealed, put at risk. Worse, the lack of any written support timeline makes it impossible to have any kind of rational upgrade plan.

----------
A good discussion about how macOS inconsistencies and opaque updates are hurting users, for anybody interested:

"As far as macOS goes, everyone will tell you that Apple supports the current version for about a year before it’s replaced by a new major release, then provides two years of security updates for it. The strange thing about that is Apple doesn’t seem to have committed that to writing, and I’ve searched long and hard for its official policy on many occasions. This article sets out what Apple has actually done over the last few years, from OS X Mavericks onwards."
https://eclecticlight.co/2021/09/22/how-long-does-apple-support-macos/
Score: 17 Votes (Like | Disagree)
ouimetnick Avatar
48 months ago
Wish they still actively supported macOS Mojave.. Folks still use that OS for certain things (32 bit apps, dashboard, iTunes, etc)
Score: 17 Votes (Like | Disagree)
Bokito Avatar
48 months ago
Apple is more and more pushing users to use the latest OS. That they removed the option to hide the nagging notification of new OS versions with a security update was just the start. Just providing a single patch for iOS 14 after the iOS 15 launch after promising 'it would continue to receive update' was a big FU to users.

I'm using a lot of apps that are too complex to be fully compatible with a new OS on day one, so I'm still running Big Sur. I'm not sure why Apple isn't updating Big Sur and Catalina. They really should communicate about it, but Apple's communication is lacking lately. I don't see why they can't backport the fixes with minimal effort certainly if they're actively exploited.
Score: 15 Votes (Like | Disagree)
sw1tcher Avatar
48 months ago

Every company has limited engineering resources and Apple is no different.

Ideally, everything is updated at the same time with no bugs. Realistically, Apple needs to focus on the latest OS and most recent devices.
Apple, a nearly $3 trillion company, with limited engineering resources? ?

How is it that a smaller company like Microsoft can offer a much longer support window than Apple? Take a look at Windows 10. It came out on Jul 29, 2015 and Microsoft will be supporting it until Oct 14, 2025 ('https://docs.microsoft.com/en-us/lifecycle/products/windows-10-home-and-pro')

5 years of mainstream support from the release date and 10 years of extended support is pretty darn impressive.
Score: 8 Votes (Like | Disagree)
visualseed Avatar
48 months ago
I have a 2012 Mac Mini that is on the beta track for Catalina and just got notified of an update

"macOS Catalina Security Update Developer Beta 2022-004 10.15.7"

So I suspect it's in the pipe for a GM release.
Score: 7 Votes (Like | Disagree)