What is CVE-2021-30820?

CVE-2021-30820 is a critical-severity vulnerability in Apple iOS And Ipados. CVSS score: 9.8/10. Published 2021-10-19.

How severe is CVE-2021-30820?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Apple iOS And Ipados

CVE-2021-30820

A logic issue was addressed with improved state management. This issue is fixed in iOS 14.8 and iPadOS 14.8. A remote attacker may be able to cause arbitrary code execution.

Published 2021-10-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.023 (82.4th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000

Affected products

Apple iOS And Ipados — versions unspecified
Apple Ipados
Apple Iphone OS

References

support.apple.com/en-us/HT212807 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-30820?: CVE-2021-30820 is a critical-severity vulnerability in Apple iOS And Ipados. CVSS score: 9.8/10. Published 2021-10-19.
How severe is CVE-2021-30820?: Critical severity. CVSS v3 base score is 9.8 out of 10.