What is CVE-2019-8779?

CVE-2019-8779 is a critical-severity vulnerability in Apple iOS, classified under Exposure of Resource to Wrong Sphere. CVSS score: 10.0/10. Published 2019-12-18.

How severe is CVE-2019-8779?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Vulnerability in Apple iOS

CVE-2019-8779

A logic issue applied the incorrect restrictions. This issue was addressed by updating the logic to apply the correct restrictions. This issue is fixed in iOS 13.1.1 and iPadOS 13.1.1. Third party app extensions may not receive the correct sandbox restrictions.

Published 2019-12-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (72.8th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.8% 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 — versions unspecified
Apple Ipados
Apple Iphone OS

Weakness classification (CWE)

CWE-668 — Exposure of Resource to Wrong Sphere

References

support.apple.com/HT210624 (Vendor Advisory)

Frequently asked questions

What is CVE-2019-8779?: CVE-2019-8779 is a critical-severity vulnerability in Apple iOS, classified under Exposure of Resource to Wrong Sphere. CVSS score: 10.0/10. Published 2019-12-18.
How severe is CVE-2019-8779?: Critical severity. CVSS v3 base score is 10.0 out of 10.