CVE-2025-8679

CRITICAL

Extremenetworks Extremeguest Essentials < 25.5.0 - Brute Force

Title source: rule

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.

References (1)

[Vendor Advisory] https://extreme-networks.my.site.com/ExtrArticleDetail?an=000130289

Scores

CVSS v3 9.8

EPSS 0.0006

EPSS Percentile 20.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-307

Status published

Products (1)

extremenetworks/extremeguest_essentials < 25.5.0

Published Oct 01, 2025

Tracked Since Feb 18, 2026