What is CVE-2021-30888?

CVE-2021-30888 is a high-severity vulnerability in Apple iOS And Ipados, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 7.4/10. Published 2021-08-24.

How severe is CVE-2021-30888?

High severity. CVSS v3 base score is 7.4 out of 10.

Open Redirect in Apple iOS And Ipados

CVE-2021-30888

An information leakage issue was addressed. This issue is fixed in iOS 15.1 and iPadOS 15.1, macOS Monterey 12.0.1, iOS 14.8.1 and iPadOS 14.8.1, tvOS 15.1, watchOS 8.1. A malicious website using Content Security Policy reports may be able to leak information via redirect behavior .

Vulnerability class: Open Redirect

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

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.017 (76.7th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Apple iOS And Ipados — versions unspecified
Apple Ipad OS
Apple Ipados — versions 15.0
Apple Iphone OS — versions 15.0
Apple macOS — versions unspecified
Apple tvOS
Apple watchOS

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

Frequently asked questions

What is CVE-2021-30888?: CVE-2021-30888 is a high-severity vulnerability in Apple iOS And Ipados, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 7.4/10. Published 2021-08-24.
How severe is CVE-2021-30888?: High severity. CVSS v3 base score is 7.4 out of 10.