Buffer overflow in PAN-OS GlobalProtect Clientless VPN

Published: 2021-11-11
Risk Critical
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-3056
Exploitation vector Network
Public exploit N/A
Vulnerable software
Palo Alto PAN-OS
Operating systems & Components / Operating system

Vendor Palo Alto Networks, Inc.

Security Bulletin

This security bulletin contains one critical risk vulnerability.

1) Buffer overflow

EUVDB-ID: #VU58111

Risk: Critical


CVE-ID: CVE-2021-3056

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in the PAN-OS GlobalProtect Clientless VPN during SAML authentication. A remote attacker can send specially crafted request to the system, trigger memory corruption and execute arbitrary code with root privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Install updates from vendor's website.

Vulnerable software versions

Palo Alto PAN-OS: 10.0.0, 9.1 - 9.1.8, 9.0 - 9.0.13, 8.1 - 8.1.19

CPE2.3 External links


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?