CVE-2021-3052: PAN-OS: Reflected Cross-Site Scripting (XSS) in Web Interface

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-09-08 · updated 2026-06-17
Weakness: CWE-79

Description

A reflected cross-site scripting (XSS) vulnerability in the Palo Alto Network PAN-OS web interface enables an authenticated network-based attacker to mislead another authenticated PAN-OS administrator to click on a specially crafted link that performs arbitrary actions in the PAN-OS web interface as the targeted authenticated administrator. This issue impacts: PAN-OS 8.1 versions earlier than 8.1.20; PAN-OS 9.0 versions earlier than 9.0.14; PAN-OS 9.1 versions earlier than 9.1.10; PAN-OS 10.0 versions earlier than 10.0.2. This issue does not affect Prisma Access.

Affected products

Palo Alto Networks PAN-OS: from 8.1.0 before 8.1.20; from 9.0.0 before 9.0.14; from 9.1.0 before 9.1.10; from 10.0.0 before 10.0.2 — fixed in 8.1.20, 9.0.14, 9.1.10, 10.0.2
Palo Alto Networks PAN-OS: from 9.0 before 9.0.14; from 8.1 before 8.1.20; from 9.1 before 9.1.10; from 10.0 before 10.0.2 — fixed in 9.0.14, 8.1.20, 9.1.10, 10.0.2

How to fix

Upgrade to a fixed version: Palo Alto Networks PAN-OS 8.1.20, 9.0.14, 9.1.10, 10.0.2; Palo Alto Networks PAN-OS 9.0.14, 8.1.20, 9.1.10, 10.0.2. Check the vendor advisory for mitigations.

References

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