iOS 15.8.4 Security Update

What iOS 15.8.4 Fixes

iOS 15.8.4 and iPadOS 15.8.4, released March 31, 2025, fixes 3 vulnerabilities in 3 parts of the system, according to Apple's security advisory.

Apple says 3 of these flaws — CVE-2025-24200, CVE-2025-43200, CVE-2025-24201 — may already have been exploited. That makes iOS 15.8.4 an update to install now rather than at the weekend.

It has since been superseded: the newest security release for iOS 15 is iOS 15.8.8 and iPadOS 15.8.8, from May 11, 2026, which includes these fixes.

Grouped by us from the impact Apple gives for each fix; the impact lines below are Apple's own.

Exploited Before the Fix

Apple flags a fix as possibly exploited when it has a credible report that the flaw was used against real people before the patch. These are the reason to update today.

• Accessibility Exploited

  A physical attack may disable USB Restricted Mode on a locked device. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals.

  An authorization issue was addressed with improved state management.

  CVE-2025-24200

• Messages Exploited

  A logic issue existed when processing a maliciously crafted photo or video shared via an iCloud Link. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals.

  This issue was addressed with improved checks.

  CVE-2025-43200

• WebKit Exploited

  Maliciously crafted web content may be able to break out of Web Content sandbox. This is a supplementary fix for an attack that was blocked in iOS 17.2. (Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals on versions of iOS before iOS 17.2.)

  An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions.

  CVE-2025-24201

Which Devices Get iOS 15.8.4

Apple lists iOS 15.8.4 and iPadOS 15.8.4 for: iPhone 6s (all models), iPhone 7 (all models), iPhone SE (1st generation), iPad Air 2, iPad mini (4th generation), and iPod touch (7th generation).

How to Install iOS 15.8.4

On the iPhone, open Settings → General → Software Update. If more than one update is offered, the one with the higher version number is the current release; the other is for people who want to stay on the previous major version.

Security fixes are cumulative: any later release for the same version includes these as well, so if you are already past iOS 15.8.4 there is nothing to do.

Every Fix in iOS 15.8.4

The rest of Apple's advisory — every fix not already listed above, the most serious kinds first. Each entry is the part of the system affected, Apple's description of the impact and the fix, and the CVE ID.

iOS 15 Security Release History

iOS 15.8.4 in context: the security releases Apple has published for iOS 15, newest first, with the number of fixes each carried.

The Same Fixes Elsewhere

Apple ships most fixes to every platform that shares the code, and to older versions still under support. These releases close at least one of the same CVEs:

Frequently Asked Questions