title: PAN-OS: Authentication Bypass in Web Interface
description: An authentication bypass vulnerability in the Palo Alto Networks PAN-OS 8.1 web interface allows a network-based attacker with specific knowledge of the target firewall or Panorama appliance to impersonate an existing PAN-OS administrator and perform privileged actions.
problem types: CWE-290 Authentication Bypass by Spoofing
affected:
{
vendor: Palo Alto Networks
product: PAN-OS
versions:
version: 9.0 All, status: unaffected
version: 9.1 All, status: unaffected
version: 10.1 All, status: unaffected
version: 10.2 All, status: unaffected
version: 10.0 All, status: unaffected
version: 8.1, status: affected, lessThan: 8.1.24, versionType: custom, changes: [at: 8.1.24, status: unaffected]
}
{
vendor: Palo Alto Networks
product: Cloud NGFW
versions:
version: All, status: unaffected
}
{
vendor: Palo Alto Networks
product: Prisma Access
versions:
version: All, status: unaffected
}
metrics:
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
attackVector: NETWORK
attackComplexity: HIGH
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: HIGH
baseScore: 8.1
baseSeverity: HIGH
]
exploits: Palo Alto Networks is not aware of any malicious exploitation of this issue.
solutions: This issue is fixed in PAN-OS 8.1.24 and all later PAN-OS versions.
Please note that PAN-OS 8.1 has reached its software end-of-life (EoL) and is supported only on PA-200, PA-500, and PA-5000 Series firewalls and on M-100 appliances and only until each of their respective hardware EoL dates:  https://www.paloaltonetworks.com/services/support/end-of-life-announcements/hardware-end-of-life-dates.html.
workarounds: Customers with a Threat Prevention subscription can block known attacks for this vulnerability by enabling Threat ID 92720 (Applications and Threats content update 8630-7638).
To exploit this issue, the attacker must have network access to the PAN-OS web interface. You can mitigate the impact of this issue by following best practices for securing the PAN-OS web interface. Please review the Best Practices for Securing Administrative Access in the PAN-OS technical documentation at https://docs.paloaltonetworks.com/best-practices/10-1/administrative-access-best-practices/administrative-access-best-practices/deploy-administrative-access-best-practices.