Man-in-the-Middle (MitM) attack in macOS - CVE-2026-20671

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Main Vulnerability Database Vulnerabilities #VU122710

Man-in-the-Middle (MitM) attack in macOS - CVE-2026-20671

Published: February 11, 2026


Vulnerability identifier: #VU122710
CSH Severity: Medium
CVSS v4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20671
CWE-ID: CWE-300
Exploitation vector: Adjecent network
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to a logic issue in the OS kernel. A remote attacker on the local network can intercept network traffic. 


Affected software

macOS
visionOS
watchOS
tvOS
iPadOS
Apple iOS

How to mitigate CVE-2026-20671

Install updates from vendor's website.

macOS - addressed in versions 26.3 25D125, 14.8.4 23J319, 15.7.4 24G517
visionOS - update to 26.3
watchOS - update to 26.3 23S620
tvOS - update to 26.3 23K620
iPadOS - addressed in versions 18.7.5 22H311, 26.3 23D127
Apple iOS - addressed in versions 18.7.5 22H311, 26.3 23D127

External References

Related Security Bulletins