CVE-2020-9945

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

A spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, Safari 14.0.1. 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 14.0.1 — fixed in 14.0.1

How to fix

Upgrade to a fixed version: macOS 11.0.1; Apple Safari 14.0.1. Check the vendor advisory for mitigations.

References

http://seclists.org/fulldisclosure/2020/Dec/32
https://support.apple.com/en-us/HT211931
https://support.apple.com/en-us/HT211934
http://seclists.org/fulldisclosure/2020/Dec/32
https://support.apple.com/en-us/HT211931
https://support.apple.com/en-us/HT211934

Get alerted when CVE-2020-9945 or the next vulnerability affects your stack