CVE-2025-8679

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-8679", "assignerOrgId": "1c053176-eef3-4d6a-ae0b-24728c86587b", "state": "PUBLISHED", "assignerShortName": "ExtremeNetworks", "dateReserved": "2025-08-06T18:32:44.244Z", "datePublished": "2025-10-01T17:19:16.743Z", "dateUpdated": "2025-10-01T17:29:42.134Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "affected", "product": "ExtremeGuest Essentials", "vendor": "Extreme Networks", "versions": [{"status": "affected", "version": "25.4.0"}]}], "datePublic": "2025-10-01T17:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<div><div><div>In ExtremeGuest Essentials before 25.5.0, captive-portal may permit unauthorized access via manual brute-force procedure. Under certain ExtremeGuest Essentials captive-portal SSID configurations, repeated manual login attempts may allow an unauthenticated device to be marked as authenticated and obtain network access. Client360 logs may display the client MAC as the username despite no MAC-authentication being enabled.</div></div></div>"}], "value": "In ExtremeGuest Essentials before 25.5.0, captive-portal may permit unauthorized access via manual brute-force procedure. Under certain ExtremeGuest Essentials captive-portal SSID configurations, repeated manual login attempts may allow an unauthenticated device to be marked as authenticated and obtain network access. Client360 logs may display the client MAC as the username despite no MAC-authentication being enabled."}], "impacts": [{"capecId": "CAPEC-112", "descriptions": [{"lang": "en", "value": "CAPEC-112 Brute Force"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "ADJACENT", "baseScore": 7.6, "baseSeverity": "HIGH", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-307", "description": "CWE-307 Improper Restriction of Excessive Authentication Attempts", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "1c053176-eef3-4d6a-ae0b-24728c86587b", "shortName": "ExtremeNetworks", "dateUpdated": "2025-10-01T17:19:16.743Z"}, "references": [{"url": "https://extreme-networks.my.site.com/ExtrArticleDetail?an=000130289"}], "solutions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<div><div><div><p>Fixed in 25.5.0 or later.</p></div></div></div>"}], "value": "Fixed in 25.5.0 or later."}], "source": {"advisory": "SA-2025-114", "discovery": "USER"}, "title": "ExtremeGuest Essentials Captive Portal Unauthenticated Brute Force", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2025-10-01T17:29:33.624086Z", "id": "CVE-2025-8679", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T17:29:42.134Z"}}]}}

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{"affected": [{"affectedData": [{"defaultStatus": "affected", "product": "ExtremeGuest Essentials", "vendor": "Extreme Networks", "versions": [{"status": "affected", "version": "25.4.0"}]}], "source": "1c053176-eef3-4d6a-ae0b-24728c86587b"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:extremenetworks:extremeguest_essentials:*:*:*:*:*:*:*:*", "matchCriteriaId": "F996D262-3352-43E0-AE88-0DD853376BEB", "versionEndExcluding": "25.5.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In ExtremeGuest Essentials before 25.5.0, captive-portal may permit unauthorized access via manual brute-force procedure. Under certain ExtremeGuest Essentials captive-portal SSID configurations, repeated manual login attempts may allow an unauthenticated device to be marked as authenticated and obtain network access. Client360 logs may display the client MAC as the username despite no MAC-authentication being enabled."}, {"lang": "es", "value": "En ExtremeGuest Essentials antes de 25.5.0, el portal cautivo puede permitir acceso no autorizado a trav\u00e9s de un procedimiento manual de fuerza bruta. Bajo ciertas configuraciones de SSID de portal cautivo de ExtremeGuest Essentials, intentos de inicio de sesi\u00f3n manuales repetidos pueden permitir que un dispositivo no autenticado sea marcado como autenticado y obtenga acceso a la red. Los registros de Client360 pueden mostrar la MAC del cliente como el nombre de usuario a pesar de que no haya autenticaci\u00f3n MAC habilitada."}], "id": "CVE-2025-8679", "lastModified": "2026-10-12T15:10:00.207", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "ADJACENT", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.6, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "1c053176-eef3-4d6a-ae0b-24728c86587b", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-8679", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T17:29:33.624086Z", "version": "2.0.3"}}]}, "published": "2025-10-01T18:15:46.880", "references": [{"source": "1c053176-eef3-4d6a-ae0b-24728c86587b", "tags": ["Vendor Advisory"], "url": "https://extreme-networks.my.site.com/ExtrArticleDetail?an=000130289"}], "sourceIdentifier": "1c053176-eef3-4d6a-ae0b-24728c86587b", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-307"}], "source": "1c053176-eef3-4d6a-ae0b-24728c86587b", "type": "Secondary"}]}

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