CVE-2025-8679

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.

CVSS v3.1 Score

9.8

CRITICAL

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

Weakness Type (CWE)

CWE-307 CWE-307

Affected Products

Vendor	Product	Versions
extremenetworks	extremeguest_essentials	< 25.5.0

References

Advisories & Patches

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

Frequently Asked Questions

What is 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 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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-8679? +

CVE-2025-8679 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-8679? +

CVE-2025-8679 affects products from extremenetworks, specifically: extremeguest_essentials. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-8679? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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