CVE-2021-30859

Name: CVE-2021-30859
Creator: NVD / NIST
Published: 2021-08-24T19:15:14.293+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.15%

Last modified Jun 17, 2026

CVE-2021-30859 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A type confusion issue was addressed with improved state handling. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, Security Update 2021-005 Catalina. EPSS estimates a 1.15% chance of exploitation in the next 30 days.

Description

A type confusion issue was addressed with improved state handling. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, Security Update 2021-005 Catalina. A malicious application may be able to execute arbitrary code with kernel privileges.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

1.15%

62.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-843

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 14.8
Apple	Iphone Os	< 14.8
Apple	Mac Os X	< 10.15.7
Apple	Mac Os X	10.15.7
Apple	Macos	>= 11.0, < 11.6

References

Timeline

Published: Aug 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30859?

How severe is CVE-2021-30859?

CVE-2021-30859 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.15% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30859?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-30859?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST