by Kastro
Paper/Archive/CVE-2025-8679

CVE-2025-8679

Extreme Networks ExtremeGuest Essentials — ExtremeGuest Essentials Captive Portal Unauthenticated Brute Force

EPSS 0.3%CVSS 9.8
critical.is priorityof 100
35
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 27.4.274 × 205.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
ExtremeGuest Essentials25.4.0–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
ExtremeNetworks (CNA)7.6CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refextreme-networks.my.site.com/ExtrArticleDetail?an=000130289