CVE-2021-3057: Palo Alto Networks Globalprotect

High severity, CVSS 8.1. EPSS: 1.4% chance of exploitation in the next 30 days.

A stack-based buffer overflow vulnerability exists in the Palo Alto Networks GlobalProtect app that enables a man-in-the-middle attacker to disrupt system processes and potentially execute arbitrary code with SYSTEM privileges. This issue impacts: GlobalProtect app 5.1 versions earlier than GlobalProtect app 5.1.9 on Windows; GlobalProtect app 5.2 versions earlier than GlobalProtect app 5.2.8 on Windows; GlobalProtect app 5.2 versions earlier than GlobalProtect app 5.2.8 on the Universal Windows Platform; GlobalProtect app 5.3 versions earlier than GlobalProtect app 5.3.1 on Linux.

Affected products

• Palo Alto Networks Globalprotect: from 5.0, up to and including 5.0.8; from 5.0, up to and including 5.0.9; from 5.0, up to and including 5.0.10; from 5.1, up to and including 5.1.1; from 5.1, before 5.1.9 (fixed in 5.1.9); from 5.1.0, up to and including 5.1.4; …

Published 2021-10-13. Last modified 2026-06-17.