What is CVE-2021-30999?

CVE-2021-30999 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Incorrect Default Permissions. CVSS score: 4.3/10. Published 2021-08-24.

How severe is CVE-2021-30999?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Apple iOS And Ipados

CVE-2021-30999

The issue was addressed with improved permissions logic. This issue is fixed in iOS 14.6 and iPadOS 14.6. A user may be unable to fully delete browsing history.

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

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (43.5th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

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

Weakness classification (CWE)

CWE-276 — Incorrect Default Permissions

References

support.apple.com/en-us/HT212528

Frequently asked questions

What is CVE-2021-30999?: CVE-2021-30999 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Incorrect Default Permissions. CVSS score: 4.3/10. Published 2021-08-24.
How severe is CVE-2021-30999?: Medium severity. CVSS v3 base score is 4.3 out of 10.