ExtremeGuest Essentials Captive Portal Unauthenticated Brute Force
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-307.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Extreme Networks | ExtremeGuest Essentials | 25.4.0 and later | — | No fix listed | CNA |
- ExtremeGuest Essentials VendorExtreme Networks Affected 25.4.0 and later Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:extremenetworks:extremeguest_essentials:*:*:*:*:*:*:*:* | before 25.5.0 | Vulnerable | Extreme Networks |
- cpe:2.3:a:extremenetworks:extremeguest_essentials:*:*:*:*:*:*:*:* Versions before 25.5.0 Vulnerable ·Extreme Networks
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-8679
- 2026-10-03 Alias added: GHSA-pwmr-hpc5-jq8r
References
Sources
- CVE-2025-8679 · CVE Program
- CVE-2025-8679 · NVD
- FIRST EPSS
- GHSA-pwmr-hpc5-jq8r · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences