{"id":"CVE-2025-8679","title":"In ExtremeGuest Essentials before 25.5.0, captive-portal may permit unauthorized access via manual brute-force procedure","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 …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-307"],"vendor":"extremenetworks","product":"extremeguest_essentials","affected":["extremeguest_essentials < 25.5.0"],"patched":["extremeguest_essentials 25.5.0"],"published":"2025-10-01","updated":"2026-10-12","sourceUpdated":"2026-10-12T15:10:00.207","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-8679","references":[{"url":"https://extreme-networks.my.site.com/ExtrArticleDetail?an=000130289","label":"1c053176-eef3-4d6a-ae0b-24728c86587b"}],"tags":["nvd"],"epss":0.00339,"epssPercentile":0.25451,"ingestedAt":"2026-10-12T15:55:08.062Z","slug":"CVE-2025-8679","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `extremeguest_essentials < 25.5.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `extremeguest_essentials 25.5.0`","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}