What is CVE-2025-8679?

CVE-2025-8679 is a critical-severity vulnerability in Extreme Networks Extremeguest Essentials, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 9.8/10. Published 2025-10-01.

How severe is CVE-2025-8679?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-8679 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Extreme Networks Extremeguest Essentials

CVE-2025-8679

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…

EPSS: 0.003 (23.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Extreme Networks Extremeguest Essentials — versions 25.4.0
Extremenetworks Extremeguest_essentials

Weakness classification (CWE)

CWE-307 — Improper Restriction of Excessive Authentication Attempts

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

1c053176-eef3-4d6a-ae0b-24728c86587b (Vendor Advisory)

Frequently asked questions

What is CVE-2025-8679?: CVE-2025-8679 is a critical-severity vulnerability in Extreme Networks Extremeguest Essentials, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 9.8/10. Published 2025-10-01.
How severe is CVE-2025-8679?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-8679 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.