Dashboard / CVE-2026-0300

CVE-2026-0300

CRITICAL CISA KEV
ACT NOW Priority: 3.88 BB Relevance: 87/100
Published: 2026-05-06 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: X
AT: None
VC: High
VI: High
VA: High

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.

CISA Known Exploited Vulnerability

Vendor / Product Palo Alto Networks — PAN-OS
Date Added 2026-05-06
Remediation Due 2026-05-09
https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300

Weakness Classification (1)

Affected Software (163)

VendorProductVersion
paloaltonetworks pan-os 10.2.0
paloaltonetworks pan-os 10.2.1
paloaltonetworks pan-os 10.2.2
paloaltonetworks pan-os 10.2.3
paloaltonetworks pan-os 10.2.4
paloaltonetworks pan-os 10.2.5
paloaltonetworks pan-os 10.2.6
paloaltonetworks pan-os 10.2.7
paloaltonetworks pan-os 10.2.7
paloaltonetworks pan-os 10.2.7
paloaltonetworks pan-os 10.2.7
paloaltonetworks pan-os 10.2.7
paloaltonetworks pan-os 10.2.7
paloaltonetworks pan-os 10.2.7
paloaltonetworks pan-os 10.2.7
paloaltonetworks pan-os 10.2.7
paloaltonetworks pan-os 10.2.7
paloaltonetworks pan-os 10.2.7
paloaltonetworks pan-os 10.2.8
paloaltonetworks pan-os 10.2.9
paloaltonetworks pan-os 10.2.10
paloaltonetworks pan-os 10.2.10
paloaltonetworks pan-os 10.2.10
paloaltonetworks pan-os 10.2.10
paloaltonetworks pan-os 10.2.10
paloaltonetworks pan-os 10.2.10
paloaltonetworks pan-os 10.2.10
paloaltonetworks pan-os 10.2.10
paloaltonetworks pan-os 10.2.10
paloaltonetworks pan-os 10.2.10
Showing 30 of 163 entries

References & Advisories (3)

Bug Bounty Relevance

87 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction
✓ Known exploited (KEV)

CVSS Score

9.3 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:C/RE:M/U:Red

EPSS — Exploitation Probability

41.71%
Raw Score 0.417140
Percentile 98.7%
Date 2026-10-28

Intelligence Sources

kev ref →
nvd ref →

External Links