CVE-2026-0300— PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal
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I. Basic Information for CVE-2026-0300
Vulnerability Information
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Vulnerability Title
PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存写
Source: NVD (National Vulnerability Database)
Vulnerability Title
Palo Alto Networks PAN-OS 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Palo Alto Networks PAN-OS是美国Palo Alto Networks公司的一套为其防火墙设备开发的操作系统。 Palo Alto Networks PAN-OS存在缓冲区错误漏洞，该漏洞源于User-ID Authentication Portal服务在处理特定数据包时的边界检查不足。未经身份认证的攻击者可通过向目标防火墙的User-ID Authentication Portal服务发送特制的数据包，触发缓冲区溢出，从而在目标设备上以 root 权限执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Shenlong Deep Dive — AI Deep Analysis
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Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Palo Alto Networks | Cloud NGFW | - | - | |
| Palo Alto Networks | PAN-OS | 12.1.0 ~ 12.1.7 | cpe:2.3:o:palo_alto_networks:pan-os:12.1.6:*:*:*:*:*:*:* | |
| Palo Alto Networks | Prisma Access | - | - |
II. Public POCs for CVE-2026-0300
| # | POC Description | Source Link | Shenlong Link |
|---|
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default-local-hunyuan-2.0-instruct · 9377 chars
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III. Intelligence Information for CVE-2026-0300
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IV. Related Vulnerabilities
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V. Comments for CVE-2026-0300
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