Apple Releases iOS 18.3.1 Update to Fix Critical Security Flaw—Why You Should Update Now

Apple has released iOS 18.3.1 to fix a critical security flaw that allowed attackers to bypass USB Restricted Mode on locked iPhones. The update enhances state management to prevent unauthorized access. Users are advised to update their devices immediately for improved security.

Apple Releases iOS 18.3.1 Update to Fix Critical Security Flaw—Why You Should Update Now

Apple has rolled out iOS 18.3.1 for eligible iPhones, addressing a significant security vulnerability. According to an update on Apple’s support page, this update fixes an issue that allowed attackers with physical access to a device to disable USB Restricted Mode on a locked iPhone. The company noted that this flaw may have been exploited in highly sophisticated attacks targeting specific individuals.

Vulnerability in USB Restricted Mode: Apple Releases iOS 18.3.1 Update to Fix Critical Security Flaw

USB Restricted Mode is a security feature designed to prevent unauthorized access to an iPhone’s data by blocking USB accessories if the device has been locked for more than an hour. However, Apple discovered a security loophole that could bypass this protection, potentially exposing users’ data.

The iOS 18.3.1 and iPadOS 18.3.1 updates resolve this issue by improving state management within the accessibility features. Apple strongly recommends updating to the latest version to enhance security and mitigate risks.

How to Enable or Disable USB Restricted Mode: 

To check or modify USB Restricted Mode settings:

1. Open Settings and go to Face ID & Passcode.
2. Enter your device passcode when prompted.
3. Scroll to the Allow Access When Locked section and locate the Accessories toggle.
4. If the toggle is off, USB accessories will require the iPhone to be unlocked if it has been locked for more than an hour.
5. Enabling the toggle will disable USB Restricted Mode, allowing accessories to connect without unlocking the device.

How to Download and Install iOS 18.3.1

1. Open Settings.
2. Navigate to General > Software Update.
3. If iOS 18.3.1 is available, tap Download and Install.
4. After the download, choose Install Now, Install Later, or Remind Me Later.
5. If prompted, enter your passcode to proceed.

The update is available for all devices compatible with iOS 18, including the iPhone XS and newer models.