Skip to content
CVE PROGRAM SOURCE RECORD9.3 Critical

CVE-2026-0300

PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
palo_alto

Description

A buffer overflow vulnerability in the User-ID™ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. The risk of this issue is greatly reduced if you secure access to the User-ID™ Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses. Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Palo Alto Networks Cloud NGFW

Default version status: unaffected

  • Allunaffected

Palo Alto Networks PAN-OS

Default version status: unaffected

  • 12.1.0 to < 12.1.7affected
  • 11.2.0 to < 11.2.12affected
  • 11.1.0 to < 11.1.15affected
  • 10.2.0 to < 10.2.18-h6affected

Palo Alto Networks Prisma Access

Default version status: unaffected

  • Allunaffected

References