What is CVE-2020-9993?

CVE-2020-9993 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 4.3/10. Published 2020-12-08.

How severe is CVE-2020-9993?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Apple iOS And Ipados

CVE-2020-9993

The issue was addressed with improved UI handling. This issue is fixed in watchOS 7.0, Safari 14.0, iOS 14.0 and iPadOS 14.0. Visiting a malicious website may lead to address bar spoofing.

Published 2020-12-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.011 (64.8th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: +0.000

Affected products

Apple iOS And Ipados — versions unspecified
Apple Ipados
Apple Iphone OS
Apple Safari — versions unspecified, 14.0
Apple watchOS — versions unspecified

Weakness classification (CWE)

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

References

support.apple.com/en-us/HT211850 (Vendor Advisory)
support.apple.com/en-us/HT211844 (Vendor Advisory)
support.apple.com/en-us/HT211845 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-9993?: CVE-2020-9993 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 4.3/10. Published 2020-12-08.
How severe is CVE-2020-9993?: Medium severity. CVSS v3 base score is 4.3 out of 10.