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

> CVE-2021-30900: Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability. CVSS 7.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-30900
Last updated: 2025-10-21T23:25:36Z

- Published: 2021-08-24 18:50 UTC · Updated: 2025-10-21 23:25 UTC · Assigner: apple
- CVSS: 7.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 5.2%, 92th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2023-03-30, federal due date 2023-04-20, ransomware use: Unknown

## Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Apple: iOS and iPadOS

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-30900)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-30900)
- [https://support.apple.com/en-us/HT212867](https://support.apple.com/en-us/HT212867)
- [https://support.apple.com/en-us/HT212868](https://support.apple.com/en-us/HT212868)
- [https://support.apple.com/kb/HT212872](https://support.apple.com/kb/HT212872)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-30900 · Markdown: https://rewindex.com/cve/CVE-2021-30900.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-30900 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:17:10.850Z