CVE-2026-25823

Critical severity, CVSS 9.8. EPSS: 1% chance of exploitation in the next 30 days.

HMS Networks Ewon Flexy with firmware before 15.0s4, Cosy+ with firmware 22.xx before 22.1s6, and Cosy+ with firmware 23.xx before 23.0s3 have a stack buffer overflow that leads to a Denial of Service, which can also be exploited to achieve Unauthenticated Remote Code Execution.

Published 2026-03-13. Last modified 2026-06-17.