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Remote Code Execution Vulnerability in Palo Alto Networks PAN-OS

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: CRITICAL

Software Affected

PAN-OS 12.1 versions prior to 12.1.4-h5 and 12.1.7

PAN-OS 11.2 versions prior to 11.2.4-h17, 11.2.7-h13, 11.2.10-h6 and 11.2.12

PAN-OS 11.1 versions prior to 11.1.4-h33, 11.1.6-h32, 11.1.7-h6, 11.1.10-h25, 11.1.13-h5 and 11.1.15

PAN-OS 10.2 versions prior to 10.2.7-h34, 10.2.10-h36, 10.2.13-h21, 10.2.16-h7 and 10.2.18-h6

Overview

A critical vulnerability has been reported in Palo Alto Networks PAN-OS that may allow a unauthenticated remote attacker to execute arbitrary code with root privileges on the targeted system

Target Audience:

Organizations using PAN-OS based PA-Series and VM-Series firewalls.

Risk Assessment:

Critical risk of compromise of system integrity.

Impact Assessment:

Potential for complete system compromise.

Description

Palo Alto Networks PAN-OS is a network security operating system designed for PA-Series and VM-Series firewalls, providing enterprise-grade network security and threat prevention capabilities.

A vulnerability has been reported in the User-ID™ Authentication Portal (Captive Portal) service of Palo Alto Networks PAN-OS due to an out-of-bounds write condition leading to a buffer overflow. A remote attacker may exploit this vulnerability by sending specially crafted requests.

Successful exploitation of this vulnerability could allow an unauthenticated remote attacker to execute arbitrary code with root privileges on the targeted system.

Solution

Apply appropriate security updates as mentioned in:

https://security.paloaltonetworks.com/CVE-2026-0300

Vendor Information

Palo Alto

https://security.paloaltonetworks.com/

References

 

https://security.paloaltonetworks.com/CVE-2026-0300

CVE Name

CVE-2026-0300

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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