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CVE-2025-8679

ExtremeGuest Essentials Captive Portal Unauthenticated Brute Force

Published: Oct 1, 2025Updated: Jan 15, 2026 Sources: CVE List NVDCWE-307
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
0.3%
Top 76.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-307

Affected Products

ExtremeGuest EssentialsExtreme Networks
On-prem
Networking Infrastructure / network-management
extremeguest essentialsextremenetworks
On-prem
Networking Infrastructure / router-switch
extreme networkscommercialUSNetworking Infrastructureaka extreme, extreme networks inc
extremenetworkscommercialUSNetworking Infrastructureaka extreme networks

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Credential Access
View detailed technique mapping

References

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

Timeline

Published
Oct 1, 2025
Last Updated
Jan 15, 2026

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