CVE-2026-25818

| EUVD-2026-11711 CRITICAL
2026-03-13 [email protected]
9.1
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

3
Analysis Generated
Mar 13, 2026 - 20:00 vuln.today
EUVD ID Assigned
Mar 13, 2026 - 20:00 euvd
EUVD-2026-11711
CVE Published
Mar 13, 2026 - 19:54 nvd
CRITICAL 9.1

Tags

Information Disclosure

Description

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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Priority Score

46
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +46
POC: 0

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CVE-2026-25818 vulnerability details – vuln.today
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