# CVE-2021-30900: Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability

Source: https://junglewise.ai/threats/cve-2021-30900-apple-ios-ipados-and-macos-out-of-bounds-write-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-03-30. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2021-30900 · Severity: critical · CVSS 7.8 · Exploited in the wild · Published 2023-03-30

An out-of-bounds write vulnerability in Apple GPU drivers allows a malicious application to execute arbitrary code with kernel privileges. The issue was addressed through improved bounds checking in iOS, iPadOS, and macOS.

Technologies: [Apple iPadOS](https://junglewise.ai/threats/technologies/ipados), [Apple macOS](https://junglewise.ai/threats/technologies/macos), [Apple watchOS](https://junglewise.ai/threats/technologies/watchos), [Cisco IOS](https://junglewise.ai/threats/technologies/ios). Vendors: [Apple](https://junglewise.ai/threats/vendors/apple), [Cisco](https://junglewise.ai/threats/vendors/cisco).

## Quick answers

**Is CVE-2021-30900 exploited in the wild?** Yes. CVE-2021-30900 is known to be exploited in the wild, first recorded on 30 March 2023. Treat it as urgent.

**How severe is CVE-2021-30900?** Critical severity, with a CVSS score of 7.8, published 30 March 2023.

**Which products and versions are affected?** Apple iOS up to (excluding) 14.8.1, 15.0; Apple iPadOS up to (excluding) 14.8.1, 15.0; Apple macOS Big Sur up to (excluding) 11.6.1.

**Is there a fix for CVE-2021-30900?** A patch was published on 2021-10-26: Fixed in iOS 14.8.1, iPadOS 14.8.1, and macOS Big Sur 11.6.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2021-30900 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2021-30900?** Check whether you run Apple iPadOS, Apple macOS, Apple watchOS or one of the others listed. 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 iOS up to (excluding) 14.8.1, 15.0
- Apple iPadOS up to (excluding) 14.8.1, 15.0
- Apple macOS Big Sur up to (excluding) 11.6.1

## Timeline

- 2021-10-26: patched: Fixed in iOS 14.8.1, iPadOS 14.8.1, and macOS Big Sur 11.6.1
- 2023-03-30: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2023-03-30: disclosed: NVD publication date

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