ExtremeGuest Essentials Captive Portal Unauthenticated Brute Force_CVE-2025-8679

7.6 / 10

HIGH

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

Description

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.

Basic Information

ID CVE-2025-8679

Source ExtremeNetworks

Published Oct 1, 2025 at 17:19

Modified Oct 1, 2025 at 17:29

Affected Product

Vendor Extreme Networks

Product ExtremeGuest Essentials

Version 25.4.0

Affected Versions Extreme Networks ExtremeGuest Essentials 25.4.0

CWE Classification

CWE-307

References

extreme-networks.my.site.com /ExtrArticleDetail

{
    "lastseen": "",
    "description": "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.",
    "published": "2025-10-01T17:19:16.743Z",
    "modified": "2025-10-01T17:29:42.134Z",
    "type": "cve",
    "title": "ExtremeGuest Essentials Captive Portal Unauthenticated Brute Force",
    "source": "ExtremeNetworks",
    "references": "https://extreme-networks.my.site.com/ExtrArticleDetail?an=000130289",
    "id": "CVE-2025-8679",
    "bulletinFamily": "",
    "cwe": [
        "CWE-307"
    ],
    "cvelist": null,
    "sourceData": "Extreme Networks ExtremeGuest Essentials 25.4.0",
    "sourceHref": "",
    "cvss": {
        "score": 7.6,
        "severity": "HIGH",
        "vector": "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"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "ExtremeGuest Essentials",
    "version": "25.4.0",
    "vendor": "Extreme Networks",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}