CVE-2026-0300CRITICAL 9.8CISA KEVEPSS p98.1%

CVE-2026-0300Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability

Palo Alto Networks / PAN-OS

Description

Palo Alto Networks PAN-OS contains an out-of-bounds write vulnerability in the User-ID Authentication Portal (aka Captive Portal) service that can allow an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS31.76% probability of exploitation · percentile 98.1% · 2026-06-18T12:00:27Z
Published2026-05-06
Last modified2026-05-12

CISA KEV entry

Added to KEV: 2026-05-06

Underlying weaknesses· 1

CWE-787

References

  1. https://security.paloaltonetworks.com/CVE-2026-0300
  2. https://cert-portal.siemens.com/productcert/html/ssa-967325.html
  3. https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0300

1

TypeTargetConfidenceTier
WeaknessOut-of-bounds Writecwe-7870%live

(incoming)1

TypeTargetConfidenceTier
KEVEntryPalo Alto Networks PAN-OS Out-of-bounds Write Vulnerabilitykev-cve-2026-03000%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

CVE
Palo Alto Networks PAN-OS Authentication Bypass Vulnerability
CVE
Palo Alto Networks PAN-OS Management Interface OS Command Injection Vulnerability
CVE
Palo Alto Networks PAN-OS Command Injection Vulnerability
CVE
Palo Alto Networks PAN-OS Management Interface Authentication Bypass Vulnerability
CVE
CVE-2026-0273
CVE
CVE-2026-0261
Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.