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CVE-2021-3052

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

High8.0EPSS 0.63%
Published
Updated
Reserved
Assigned by
palo_alto

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.

Timeline

  1. ID reserved

    By palo_alto

  2. · 8 months later

    Published

  3. · 3 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2021-3052, by who scored it
Scored byCVSSScoreVector
palo_altoCNA (assigner)3.1High8.0CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
NVDNVD · Modified3.1Medium5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
EPSS (exploitation in 30 days)
0.63% · top 50% of all CVEs (7 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.0.

Weakness

Affected products

  • Palo Alto Networks · PAN-OS

    • unaffected 10.1.*
    • affected 9.0 – < 9.0.14
    • affected 8.1 – < 8.1.20
    • affected 9.1 – < 9.1.10
    • affected 10.0 – < 10.0.2

What to do

Solution: This issue is fixed in PAN-OS 9.0.14, PAN-OS 8.1.20, PAN-OS 9.1.10, PAN-OS 10.0.2, PAN-OS 10.1.0, and all later PAN-OS versions.

Workaround: This issue requires the attacker to have authenticated 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.

Exploitation: Palo Alto Networks is not aware of any malicious attempts to exploit this vulnerability.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .