{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-0300", "assignerOrgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0", "state": "PUBLISHED", "assignerShortName": "palo_alto", "dateReserved": "2025-11-03T20:44:58.173Z", "datePublished": "2026-05-06T18:57:39.876Z", "dateUpdated": "2026-07-14T12:45:19.808Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0", "shortName": "palo_alto", "dateUpdated": "2026-05-06T22:09:48.796Z" }, "title": "PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal", "datePublic": "2026-05-05T23:00:00.000Z", "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-787", "description": "CWE-787: Out-of-bounds Write", "type": "CWE" } ] } ], "impacts": [ { "capecId": "CAPEC-100", "descriptions": [ { "lang": "en", "value": "CAPEC-100 Overflow Buffers" } ] } ], "affected": [ { "vendor": "Palo Alto Networks", "product": "Cloud NGFW", 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Networks", "product": "Prisma Access", "versions": [ { "status": "unaffected", "version": "All", "versionType": "custom" } ], "defaultStatus": "unaffected" } ], "cpeApplicability": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*", "versionEndExcluding": "12.1.4-h5", "versionStartIncluding": "12.1.4", "vulnerable": true }, { "criteria": "cpe:2.3:o:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*", "versionEndExcluding": "12.1.7", "versionStartIncluding": "12.1.0", "vulnerable": true }, { "criteria": "cpe:2.3:o:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*", "versionEndExcluding": "11.2.4-h17", "versionStartIncluding": "11.2.4", "vulnerable": true }, { "criteria": "cpe:2.3:o:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*", "versionEndExcluding": "11.2.7-h13", "versionStartIncluding": "11.2.7", "vulnerable": true }, { "criteria": "cpe:2.3:o:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*", "versionEndExcluding": "11.2.10-h6", "versionStartIncluding": "11.2.10", 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"operator": "OR" } ], "operator": "OR" } ], "descriptions": [ { "lang": "en", "value": "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 by restricting access to only trusted internal IP addresses.\n\nPrisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "

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 by restricting access to only trusted internal IP addresses.

Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.

" } ] } ], "references": [ { "url": "https://security.paloaltonetworks.com/CVE-2026-0300", "tags": [ "vendor-advisory" ] } ], "metrics": [ { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "The risk is highest when you configure the User-ID™ Authentication Portal to enable access from the Internet or any untrusted network." } ], "cvssV4_0": { "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "LOW", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "ATTACKED", "Safety": "NOT_DEFINED", "Automatable": "YES", "Recovery": "USER", "valueDensity": "CONCENTRATED", "vulnerabilityResponseEffort": "MODERATE", "providerUrgency": "RED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 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" } }, { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "You can greatly reduce the risk of exploitation by restricting User-ID™ Authentication Portal access to only trusted internal IP addresses and preventing its exposure to the internet." } ], "cvssV4_0": { "attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "LOW", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "ATTACKED", "Safety": "NOT_DEFINED", "Automatable": "YES", "Recovery": "USER", "valueDensity": "CONCENTRATED", "vulnerabilityResponseEffort": "MODERATE", "providerUrgency": "RED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 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" } } ], "configurations": [ { "lang": "eng", "value": "This issue is applicable only to PA-Series and VM-Series firewalls that are configured to use User-ID™ Authentication Portal.\n\nCustomers are impacted if both of the following conditions are true:\n\n\n * User-ID™ Authentication Portal configured in the User-ID™ Authentication Portal Settings page. You can verify the configuration by going to Device > User Identification > Authentication Portal Settings -> Enable Authentication Portal (applies to both transparent and redirect modes) and\n * An interface management profile with response pages enabled and associated with an external/internet-accessible interface. You can verify the configuration by going to Network > Interface > Select the interface > Advanced Tab > Create Management Interface Profile.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "

This issue is applicable only to PA-Series and VM-Series firewalls that are configured to use User-ID™ Authentication Portal.

Customers are impacted if both of the following conditions are true:

" } ] } ], "workarounds": [ { "lang": "eng", "value": "Customers can mitigate the risk of this issue by taking either of the following actions:\n\n * Restrict User-ID™ Authentication Portal access to only trusted zones and in addition, disable Response Pages in the Interface Management Profile attached to every L3 interface in any zone where untrusted/internet traffic can ingress. Keep Response Pages enabled only on interfaces in trust/internal zones where legitimate users' browsers ingress. Refer to Step 6 of the following Live Community article (https://live.paloaltonetworks.com/t5/general-articles/why-it-s-essential-to-secure-your-management-interface/ta-p/1001286) and Knowledgebase article (https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000CqbiCAC) for steps to restrict access.\n \n * Disable User-ID™ Authentication Portal if not required.\n \n\nCustomers with a Threat Prevention subscription can block attacks for this vulnerability by enabling Threat ID 510019 from Applications and Threats content version 9097-10022. Decoder capabilities necessitate PAN-OS 11.1 or a later version for Threat ID support.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "Customers can mitigate the risk of this issue by taking either of the following actions:
Customers with a Threat Prevention subscription can block attacks for this vulnerability by enabling Threat ID 510019 from Applications and Threats content version 9097-10022. Decoder capabilities necessitate PAN-OS 11.1 or a later version for Threat ID support." } ] } ], "solutions": [ { "lang": "eng", "value": "This issue will be fixed in upcoming releases of PAN-OS as captured in the table above.\n\nWe strongly recommend that you secure access to your User-ID™ Authentication Portal following the instructions in the workarounds section below.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "This issue will be fixed in upcoming releases of PAN-OS as captured in the table above.

We strongly recommend that you secure access to your User-ID™ Authentication Portal following the instructions in the workarounds section below." } ] } ], "exploits": [ { "lang": "en", "value": "Limited exploitation has been observed targeting Palo Alto Networks User-ID™ Authentication Portals that are exposed to untrusted IP addresses and/or the public internet. Customers following standard security best practices, such as restricting sensitive portals to trusted internal networks are at a greatly reduced risk.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "Limited exploitation has been observed targeting Palo Alto Networks User-ID™ Authentication Portals that are exposed to untrusted IP addresses and/or the public internet. Customers following standard security best practices, such as restricting sensitive portals to trusted internal networks are at a greatly reduced risk." } ] } ], "timeline": [ { "time": "2026-05-06T17:27:00.000Z", "lang": "en", "value": "Updated with Threat Prevention ID and clarified the Required Configuration section." }, { "time": "2026-05-05T23:00:00.000Z", "lang": "en", "value": "Initial publication." } ], "source": { "discovery": "USER" }, "x_generator": { "engine": "Vulnogram 0.1.0-dev" }, "x_affectedList": [ "PAN-OS 12.1.6", "PAN-OS 12.1.5", "PAN-OS 12.1.4-h3", "PAN-OS 12.1.4-h2", "PAN-OS 12.1.4", "PAN-OS 12.1.3-h3", "PAN-OS 12.1.3-h1", "PAN-OS 12.1.3", "PAN-OS 12.1.2", "PAN-OS 11.2.11", "PAN-OS 11.2.10-h4", "PAN-OS 11.2.10-h3", "PAN-OS 11.2.10-h2", "PAN-OS 11.2.10-h1", "PAN-OS 11.2.10", "PAN-OS 11.2.9", "PAN-OS 11.2.8", "PAN-OS 11.2.7-h11", "PAN-OS 11.2.7-h10", "PAN-OS 11.2.7-h8", "PAN-OS 11.2.7-h7", "PAN-OS 11.2.7-h4", "PAN-OS 11.2.7-h3", "PAN-OS 11.2.7-h2", "PAN-OS 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"adp": [ { "references": [ { "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0300", "tags": [ "government-resource" ] } ], "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-05-06T00:00:00+00:00", "options": [ { "Exploitation": "active" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-0300" } } }, { "other": { "type": "kev", "content": { "dateAdded": "2026-05-06", "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0300" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-07T03:55:34.043Z" }, "timeline": [ { "time": "2026-05-06T00:00:00.000Z", "lang": "en", "value": "CVE-2026-0300 added to CISA KEV" } ] }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:45:19.808Z" }, "affected": [ { "vendor": "Siemens", "product": "RUGGEDCOM APE1808", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-967325.html" } ] } ] } }