EUVD-2026-11711
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Lifecycle Timeline
3Description
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 weak entropy for authentication cookies, allowing an attacker with a stolen session cookie to find the user password by brute-forcing an encryption parameter.
Analysis
Weak encryption in HMS Networks Ewon Flexy/Cosy+ firmware.
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Remediation
Within 24 hours: Inventory all HMS Networks Ewon routers in your environment and identify affected firmware versions (Flexy <15.0s4, Cosy+ 22.xx <22.1s6, Cosy+ 23.xx <23.0s3). Within 7 days: Implement network segmentation to isolate affected routers from untrusted networks, disable remote management features if not operationally critical, and monitor session logs for suspicious authentication attempts. …
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External POC / Exploit Code
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