# CVE-2021-30661: Apple Multiple Products WebKit Storage Use-After-Free Vulnerability

Source: https://junglewise.ai/threats/cve-2021-30661-apple-multiple-products-webkit-storage-use-after-free  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2021-30661 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2021-11-03

A use-after-free vulnerability in Apple WebKit Storage allows for arbitrary code execution when processing maliciously crafted web content. The issue was addressed through improved memory management across multiple Apple operating systems and the Safari browser.

Technologies: [Apple Multiple Products](https://junglewise.ai/threats/technologies/multiple-products). Vendors: [Apple](https://junglewise.ai/threats/vendors/apple).

## Quick answers

**Is CVE-2021-30661 exploited in the wild?** Yes. CVE-2021-30661 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2021-30661?** Critical severity, with a CVSS score of 8.8, published 3 November 2021.

**Which products and versions are affected?** Apple WebKit Storage; Apple Safari before 14.1; Apple iOS before 12.5.3, 14.0 to 14.5; Apple iPadOS before 14.5; and 3 more.

**Is there a fix for CVE-2021-30661?** A patch was published: Fixed in Safari 14.1, iOS 12.5.3, iOS 14.5, iPadOS 14.5, watchOS 7.4, tvOS 14.5, and macOS Big Sur 11.3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2021-30661 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2021-30661?** Check whether you run Apple Multiple Products. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Apple WebKit Storage
- Apple Safari before 14.1
- Apple iOS before 12.5.3, 14.0 to 14.5
- Apple iPadOS before 14.5
- Apple watchOS before 7.4
- Apple tvOS before 14.5
- Apple macOS Big Sur 11.0 to 11.3

## Timeline

- 2021-09-08: disclosed: NVD Published Date
- 2021-11-03: kev added: Date added to CISA Known Exploited Vulnerabilities Catalog
- exploited: Apple is aware of reports that this issue may have been actively exploited.
- patched: Fixed in Safari 14.1, iOS 12.5.3, iOS 14.5, iPadOS 14.5, watchOS 7.4, tvOS 14.5, and macOS Big Sur 11.3.

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