What is CVE-2019-8771?

CVE-2019-8771 is a medium-severity vulnerability in Apple iOS, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 6.1/10. Published 2020-10-27.

How severe is CVE-2019-8771?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2019-8771 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Apple iOS

CVE-2019-8771

This issue was addressed with improved iframe sandbox enforcement. This issue is fixed in Safari 13.0.1, iOS 13. Maliciously crafted web content may violate iframe sandboxing policy.

Published 2020-10-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Apple iOS — versions unspecified
Apple Iphone OS
Apple Safari — versions unspecified

Weakness classification (CWE)

CWE-1021 — Improper Restriction of Rendered UI Layers or Frames (Clickjacking)

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

support.apple.com/en-us/HT210606 (Vendor Advisory)
support.apple.com/en-us/HT210605 (Vendor Advisory)

Frequently asked questions

What is CVE-2019-8771?: CVE-2019-8771 is a medium-severity vulnerability in Apple iOS, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 6.1/10. Published 2020-10-27.
How severe is CVE-2019-8771?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2019-8771 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.