What watchOS 11.3.1 Fixes
watchOS 11.3.1, released February 10, 2025, fixes 1 vulnerability in 1 part of the system, according to Apple's security advisory.
Apple says one of these flaws — CVE-2025-43200 — may already have been exploited. That makes watchOS 11.3.1 an update to install now rather than at the weekend.
It has since been superseded: the newest security release for watchOS 11 is watchOS 11.6, from July 29, 2025, which includes these fixes.
| What an attacker could do | Fixes |
|---|---|
| Other | 1 |
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. This one is the reason to update today.
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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
Which Devices Get watchOS 11.3.1
Apple lists watchOS 11.3.1 for: Apple Watch Series 6 and later.
How to Install watchOS 11.3.1
Open the Watch app on the paired iPhone, then General → Software Update. The watch needs to be on its charger and within range of the iPhone.
Security fixes are cumulative: any later release for the same version includes these as well, so if you are already past watchOS 11.3.1 there is nothing to do.
Every Fix in watchOS 11.3.1
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.
watchOS 11 Security Release History
watchOS 11.3.1 in context: the security releases Apple has published for watchOS 11, newest first, with the number of fixes each carried.
| Release | Released | Fixes |
|---|---|---|
| watchOS 11.6 | July 29, 2025 | 23 |
| watchOS 11.5 | May 12, 2025 | 26 Exploited |
| watchOS 11.4 | April 1, 2025 | 51 Exploited |
| watchOS 11.3.1 | February 10, 2025 | 1 Exploited |
| watchOS 11.3 | January 27, 2025 | 20 |
| watchOS 11.2 | December 11, 2024 | 32 |
| watchOS 11.1 | October 28, 2024 | 23 |
| watchOS 11 | September 16, 2024 | 16 |
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
What does watchOS 11.3.1 fix?
1 security vulnerability in 1 part of the system, from Apple's advisory of February 10, 2025.
Was anything fixed in watchOS 11.3.1 exploited?
Yes. Apple says CVE-2025-43200 may have been exploited before the fix. Install it now.
Which devices can install watchOS 11.3.1?
Apple Watch Series 6 and later.
Is watchOS 11.3.1 the latest security update?
No. watchOS 11.6, from July 29, 2025, is newer and includes these fixes.
Source: About the security content of watchOS 11.3.1, Apple. Rechecked automatically while Apple is still adding entries.