CVE Watch26 de out. de 2026

CVE-2026-0300

Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability

CVSS

9.8

Crítica

EPSS

41.7%

p99

KEV

SIM

6 de mai. de 2026

Exploit Today

0-100

Publicado: 6 de mai. de 2026 · Última mod.: 26 de out. de 2026 · CWE-787

EPSS · 30d

31.7%EPSS · 30 dias41.7%

2026-10-082026-11-05

Ficha do catálogo KEV

Produto

Palo Alto Networks / PAN-OS

Vulnerabilidade

Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability

Adicionado ao KEV

6 de mai. de 2026

Corrigir até

9 de mai. de 2026

Uso conhecido em ransomware

Não

Descrição resumida

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.

Ação necessária

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Until the vendor releases an official fix, the following workaround should be implemented: - Restrict User-ID Authentication Portal access to only trusted zones. - Disable User-ID Authentication Portal if not required. 5/13/2026: Palo Alto has released a variety of patches. If these are relevant to your environment, please apply the designated patch.

Notas

https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300

Descrição técnica

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.

Referências oficiais

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