CVE-2020-9942

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-12-08 · updated 2026-06-17
Weakness: CWE-1021

Description

An inconsistent user interface issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.0.1, Safari 13.1.2. Visiting a malicious website may lead to address bar spoofing.

Affected products

macOS: before 11.0.1 — fixed in 11.0.1
Apple Safari: before 13.1.2 — fixed in 13.1.2

How to fix

Upgrade to a fixed version: macOS 11.0.1; Apple Safari 13.1.2. Check the vendor advisory for mitigations.

References

http://seclists.org/fulldisclosure/2020/Dec/32
https://support.apple.com/en-us/HT211292
https://support.apple.com/en-us/HT211931
http://seclists.org/fulldisclosure/2020/Dec/32
https://support.apple.com/en-us/HT211292
https://support.apple.com/en-us/HT211931

Get alerted when CVE-2020-9942 or the next vulnerability affects your stack