CVE-2021-30900

HIGH7.8

CISA KEV

Published 2021-08-24 · Updated 2026-06-17 · Source product-security@apple.com

Summary

CVE-2021-30900 is a high-severity (CVSS 7.8) vulnerability in Apple iOS, iPadOS, and macOS. CISA added it to the Known Exploited Vulnerabilities catalog on March 30, 2023, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by April 20, 2023. CISA does not currently list it as used in ransomware campaigns. Apple has 96 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 96 known-exploited Apple vulnerabilities →

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.

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-787CWE-787

CISA Known-Exploited Vulnerability

Product: Apple — iOS, iPadOS, and macOS

Name: Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability

Date added: 2023-03-30 · Due: 2023-04-20

Required action: Apply updates per vendor instructions.

References

View on NVD

More exploited Apple vulnerabilities

Most recently added to CISA KEV

CVE-2024-27834
Multiple Products — Apple Multiple Products Improper Authentication Vulnerability
added 2026-11-04
CVE-2026-86950
Multiple Products — Apple Multiple Products Out-of-Bounds Write Vulnerability
added 2026-09-29
CVE-2026-65400
macOS — Apple macOS Improper Authentication Vulnerability
added 2026-08-18
CVE-2025-43510
Multiple Products — Apple Multiple Products Improper Locking Vulnerability
added 2026-03-20
CVE-2025-43520
Multiple Products — Apple Multiple Products Classic Buffer Overflow Vulnerability
added 2026-03-20
CVE-2025-31277
Multiple Products — Apple Multiple Products Buffer Overflow Vulnerability
added 2026-03-20

View all →

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