CVE-2025-8679

ExtremeGuest Essentials Captive Portal Unauthenticated Brute Force

CVSS 7.6 HIGHEPSS 0.3%CWE-307

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.6EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

01 Oct 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

Extreme Networks · ExtremeGuest Essentials

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References

https://extreme-networks.my.site.com/ExtrArticleDetail?an=000130289