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 v4.0: 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/E:U/U:Green

CVE-ID: CVE-2026-20671

CWE-ID: CWE-300

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

Vendor: Apple Inc.

Affected software:
macOS

Detailed vulnerability description

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.

Install updates from vendor's website.