Denial of service in PAN-OS GlobalProtect Portal and Gateway interfaces

Published: 2021-11-11
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-3063
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 medium risk vulnerability.

1) Improper Handling of Exceptional Conditions

EUVDB-ID: #VU58106

Risk: Medium


CVE-ID: CVE-2021-3063

CWE-ID: CWE-755 - Improper Handling of Exceptional Conditions

Exploit availability: No


The vulnerability allows a remote attacker to perform denial of service (DoS) attack.

The vulnerability exists due to improper handling of exceptional conditions in GlobalProtect portal and gateway interfaces. A remote non-authenticated attacker can send specifically crafted traffic to a GlobalProtect interface that causes the service to stop responding.

Successful exploitation of the vulnerability may result in a denial of service (DoS) attack.


Install updates from vendor's website.

Vulnerable software versions

Palo Alto PAN-OS: 10.1.0 - 10.1.2, 10.0.0 - 10.0.8, 9.1 - 9.1.11-h2, 9.0 - 9.0.14-h3, 8.1 - 8.1.20-h1

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?