CVE-2025-8679 ExtremeGuest Essentials Captive Portal Unauthenticated Brute Force
Unauthenticated attackers can bypass captive portal authentication via brute force under specific SSID configurations, gaining unauthorized network access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-8679?
CVE-2025-8679 is a high-severity authentication bypass vulnerability in ExtremeGuest Essentials, published on 1 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-307
Which versions are affected by CVE-2025-8679?
It affects 1 product.
Products include Extremenetworks Extremeguest Essentials.
How do I fix CVE-2025-8679?
No fix has been published for CVE-2025-8679 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2025-8679 being exploited?
There is no known exploitation of CVE-2025-8679 in the wild and no public exploit code.
Sources
Also known as GHSA-pwmr-hpc5-jq8r.