Actively exploitedCVSS 9.1 · CRITICAL

CVE-2026-0257

Palo Alto Networks PAN-OS contains an authentication bypass vulnerability that allows attackers to bypass security restrictions and establish an unauthorized VPN connection.

View on NVD

Analysis

Esta vulnerabilidad en Palo Alto Networks PAN-OS permite a atacantes saltarse la autenticación en GlobalProtect y establecer conexiones VPN no autorizadas. El fallo está siendo explotado activamente en el mundo real según el catálogo KEV de CISA. Es una amenaza crítica para la seguridad del acceso remoto y la infraestructura corporativa de red.

Relevant roles

CyberSecurityCloudLinux

Severity

Score: 9.1(CRITICAL)

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

AV: NETWORK

AC: LOW

PR: NONE

UI: NONE

S: UNCHANGED

C: HIGH

I: HIGH

A: NONE

Weakness (CWE): CWE-565

CISA KEV

Added to KEV: 2026-05-29

Federal patch deadline: 2026-06-01

Known ransomware use: Unknown

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

EPSS

Probability of exploitation (next 30 days): 0.5879 (58.8%)

Percentile: 98.3%

EPSS: 2026-06-12

Affects

paloaltonetworks:pan-ospaloaltonetworks:prisma_accesssiemens:ruggedcom_ape1808_firmwaresiemens:ruggedcom_ape1808

Technical description

Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection. Panorama and Cloud NGFW are not impacted by these issues.

Published: 5/13/2026, 7:17:01 PM

Last modified: 6/9/2026, 12:47:03 PM

References

How to read this card

Actively exploited

KEV (Known Exploited Vulnerabilities) is CISA's catalog of CVEs confirmed as actively exploited in the real world. If a CVE is on KEV, someone is already using it in attacks.

CVSS 10.0

CVSS 10.0 — máxima severidad teórica. Explotable de forma remota, sin privilegios, con impacto total. Aún no confirmada como explotada en el mundo real, pero parchea ya.

AI-recommended

Un modelo de lenguaje revisó el CVE y consideró que afecta a software ampliamente desplegado o herramientas comunes de desarrollo. Un humano del equipo aprobó la publicación antes de que llegara aquí.

Categorías de impacto que evalúa la IA

widely_deployed_infra — kernel Linux, OpenSSL, glibc, k8s, Docker, nginx, OpenSSH.

popular_dev_tooling — Node.js, Python, Go, React, Next.js, librerías comunes de npm/pip.

common_consumer_software — Chrome, Firefox, Windows, macOS, apps móviles populares.

enterprise_saas — GitHub, GitLab, Atlassian, Salesforce, Cisco, Fortinet, Ivanti.

niche_software — CMS regionales, herramientas de hobby, librerías de poco uso.

not_relevant — firmware específico de proveedor, software descontinuado.

EPSS — EPSS (Exploit Prediction Scoring System) by FIRST.org estimates the probability that a CVE will be exploited in the next 30 days. Range is 0 to 1; very fresh CVEs typically score low until evidence accumulates.