What is CVE-2021-30859?

CVE-2021-30859 is a high-severity vulnerability in Apple Ipados, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 7.8/10. Published 2021-08-24.

How severe is CVE-2021-30859?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Apple Ipados

CVE-2021-30859

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.

Published 2021-08-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (65.8th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Apple Ipados
Apple Iphone OS
Apple macOS — versions unspecified
Apple Mac OS X — versions 10.15.7

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

Frequently asked questions

What is CVE-2021-30859?: CVE-2021-30859 is a high-severity vulnerability in Apple Ipados, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 7.8/10. Published 2021-08-24.
How severe is CVE-2021-30859?: High severity. CVSS v3 base score is 7.8 out of 10.