{"document":{"category":"csaf_vex","csaf_version":"2.1","notes":[{"category":"summary","text":"Palo Alto Networks PSIRT provided VEX document. This document is autogenerated.","title":"PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal"}],"publisher":{"category":"vendor","name":"Palo Alto Networks","namespace":"https://security.paloaltonetworks.com"},"title":"Palo Alto Networks PSIRT provided VEX document: CVE-2026-0300","distribution":{"text":"Copyright © 2024 Palo Alto Networks. All rights reserved.","tlp":{"label":"CLEAR","url":"https://www.first.org/tlp/"}},"tracking":{"current_release_date":"2026-05-06T06:36:09.122Z","generator":{"date":"2026-05-06T06:36:09.122Z","engine":{"name":"Vulnogram","version":"0.1.0-dev"}},"id":"CVE-2026-0300","initial_release_date":"2026-05-05T23:00:00.000Z","revision_history":[{"number":"1","date":"2026-05-05T16:00:00.000Z","summary":"Initial publication."}],"status":"final","version":"1"}},"product_tree":{"branches":[{"name":"Palo Alto Networks","category":"vendor","branches":[{"name":"Cloud NGFW","category":"product_name","branches":[{"category":"product_version","name":"Cloud NGFW All","product":{"name":"Palo Alto Networks Cloud NGFW","product_id":"PANW-Cloud-NGFW-1"}}]},{"name":"PAN-OS","category":"product_name","branches":[{"category":"product_version_range","name":"vers:generic/PAN-OS<12.1.7","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-813"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=12.1.7","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-813"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=12.1.4-h5","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-814"}},{"category":"product_version_range","name":"vers:generic/PAN-OS<11.2.12","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-815"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=11.2.12","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-815"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=11.2.10-h6","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-816"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=11.2.7-h13","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-817"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=11.2.4-h17","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-818"}},{"category":"product_version_range","name":"vers:generic/PAN-OS<11.1.15","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-819"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=11.1.15","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-819"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=11.1.13-h5","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-820"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=11.1.10-h25","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-821"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=11.1.7-h6","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-822"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=11.1.6-h32","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-823"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=11.1.4-h33","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-824"}},{"category":"product_version_range","name":"vers:generic/PAN-OS<10.2.18-h6","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-825"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=10.2.18-h6","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-825"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=10.2.16-h7","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-826"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=10.2.13-h21","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-827"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=10.2.10-h36","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-828"}},{"category":"product_version_range","name":"vers:generic/PAN-OS>=10.2.7-h34","product":{"name":"Palo Alto Networks PAN-OS","product_id":"PANW-PAN-OS-829"}}]},{"name":"Prisma Access","category":"product_name","branches":[{"category":"product_version","name":"Prisma Access All","product":{"name":"Palo Alto Networks Prisma Access","product_id":"PANW-Prisma-Access-1"}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-0300","product_status":{"fixed":["PANW-PAN-OS-813","PANW-PAN-OS-814","PANW-PAN-OS-815","PANW-PAN-OS-816","PANW-PAN-OS-817","PANW-PAN-OS-818","PANW-PAN-OS-819","PANW-PAN-OS-820","PANW-PAN-OS-821","PANW-PAN-OS-822","PANW-PAN-OS-823","PANW-PAN-OS-824","PANW-PAN-OS-825","PANW-PAN-OS-826","PANW-PAN-OS-827","PANW-PAN-OS-828","PANW-PAN-OS-829"],"known_affected":["PANW-PAN-OS-813","PANW-PAN-OS-815","PANW-PAN-OS-819","PANW-PAN-OS-825"],"known_not_affected":["PANW-Cloud-NGFW-1","PANW-Prisma-Access-1"]},"notes":[{"category":"description","text":"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.\n\nThe 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?id=kA14u000000CqbiCAC) by restricting access to only trusted internal IP addresses.\n\nPrisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability."}],"references":[{"category":"external","summary":"NVD - CVE-2026-0300","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-0300"},{"category":"self","summary":"Palo Alto Networks Security Advisory CVE-2026-0300","url":"https://security.paloaltonetworks.com/CVE-2026-0300"}],"threats":[{"category":"impact","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.\n\nThe 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?id=kA14u000000CqbiCAC) by restricting access to only trusted internal IP addresses.\n\nPrisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability."}],"scores":[{"cvss_v4":{"version":"4.0","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"LOW","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"LOW","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","Safety":"NOT_DEFINED","Automatable":"YES","Recovery":"USER","valueDensity":"CONCENTRATED","vulnerabilityResponseEffort":"MODERATE","providerUrgency":"RED","exploitMaturity":"ATTACKED","baseSeverity":"CRITICAL","baseScore":9.3,"threatSeverity":"CRITICAL","threatScore":9.3,"vectorString":"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/AU:Y/R:U/V:C/RE:M/U:Red"},"products":["PANW-PAN-OS-813","PANW-PAN-OS-815","PANW-PAN-OS-819","PANW-PAN-OS-825"]},{"cvss_v4":{"version":"4.0","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"LOW","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"LOW","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","Safety":"NOT_DEFINED","Automatable":"YES","Recovery":"USER","valueDensity":"CONCENTRATED","vulnerabilityResponseEffort":"MODERATE","providerUrgency":"RED","exploitMaturity":"ATTACKED","baseSeverity":"HIGH","baseScore":8.7,"threatSeverity":"HIGH","threatScore":8.7,"vectorString":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/AU:Y/R:U/V:C/RE:M/U:Red"},"products":["PANW-PAN-OS-813","PANW-PAN-OS-815","PANW-PAN-OS-819","PANW-PAN-OS-825"]}]}]}