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CVE-2026-0300 is a critical severity vulnerability with a CVSS score of 9.8. Exploits are available; patches have been released and should be applied urgently. This is classified as a zero-day vulnerability.
Lower probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
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.
| Vendor | Product |
|---|---|
| Paloaltonetworks | Pa 5445 |
| Paloaltonetworks |
Please cite this page when referencing data from Strobes VI. Proper attribution helps support our vulnerability intelligence research.
| Pan Os |
| Paloaltonetworks | Pa 560 |
| Paloaltonetworks | Vm 500 |
| Paloaltonetworks | Pa 410 |
| Paloaltonetworks | Pa 455 5g |
| Paloaltonetworks | Pa 455r 5g |
| Paloaltonetworks | Pa 5560 |
| Paloaltonetworks | Pa 410r 5g |
| Siemens | Ruggedcom Ape1808 |
And 40 more...