What is CVE-2021-30826?

CVE-2021-30826 is a high-severity vulnerability in Apple iOS And Ipados. CVSS score: 7.5/10. Published 2021-10-19.

How severe is CVE-2021-30826?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Apple iOS And Ipados

CVE-2021-30826

A logic issue was addressed with improved state management. This issue is fixed in iOS 15 and iPadOS 15. In certain situations, the baseband would fail to enable integrity and ciphering protection.

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

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.013 (68.4th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

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

References

support.apple.com/kb/HT212807 (Release Notes, Vendor Advisory)
support.apple.com/en-us/HT212814 (Release Notes, Vendor Advisory)
seclists.org/fulldisclosure/2021/Oct/61 (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-30826?: CVE-2021-30826 is a high-severity vulnerability in Apple iOS And Ipados. CVSS score: 7.5/10. Published 2021-10-19.
How severe is CVE-2021-30826?: High severity. CVSS v3 base score is 7.5 out of 10.