What is CVE-2021-30966?

CVE-2021-30966 is a high-severity vulnerability in Apple iOS And Ipados. CVSS score: 7.5/10. Published 2021-08-24.

How severe is CVE-2021-30966?

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

Vulnerability in Apple iOS And Ipados

CVE-2021-30966

A logic issue was addressed with improved state management. This issue is fixed in macOS Monterey 12.1, watchOS 8.3, iOS 15.2 and iPadOS 15.2, tvOS 15.2. User traffic might unexpectedly be leaked to a proxy server despite PAC configurations.

Published 2021-08-24 · 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:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.015 (73.4th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

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

References

Frequently asked questions

What is CVE-2021-30966?: CVE-2021-30966 is a high-severity vulnerability in Apple iOS And Ipados. CVSS score: 7.5/10. Published 2021-08-24.
How severe is CVE-2021-30966?: High severity. CVSS v3 base score is 7.5 out of 10.