What is CVE-2021-30884?

CVE-2021-30884 is a medium-severity vulnerability in Apple iOS And Ipados. CVSS score: 4.7/10. Published 2021-08-24.

How severe is CVE-2021-30884?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Apple iOS And Ipados

CVE-2021-30884

The issue was resolved with additional restrictions on CSS compositing. This issue is fixed in tvOS 15, watchOS 8, iOS 15 and iPadOS 15. Visiting a maliciously crafted website may reveal a user's browsing history.

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

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.012 (65.9th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.9% 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 iOS And Ipados — versions unspecified
Apple Ipados
Apple Iphone OS
Apple macOS
Apple tvOS — versions unspecified
Apple watchOS — versions unspecified

References

Frequently asked questions

What is CVE-2021-30884?: CVE-2021-30884 is a medium-severity vulnerability in Apple iOS And Ipados. CVSS score: 4.7/10. Published 2021-08-24.
How severe is CVE-2021-30884?: Medium severity. CVSS v3 base score is 4.7 out of 10.