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CVE-2021-30900

High CVSS 7.8 Known exploited

Published 2021-08-24 · last changed 2026-06-17 · added to CISA KEV 2023-03-30

This one is being exploited in the wild.

CISA added CVE-2021-30900 to the Known Exploited Vulnerabilities catalog on 2023-03-30. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2021-30900, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

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.

Sources

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