CVE-2026-25823

CRITICAL
2026-03-13 [email protected]
9.8
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:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 13, 2026 - 20:00 vuln.today
CVE Published
Mar 13, 2026 - 19:54 nvd
CRITICAL 9.8

Tags

RCE Buffer Overflow Denial Of Service Stack Overflow

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 a stack buffer overflow that leads to a Denial of Service, which can also be exploited to achieve Unauthenticated Remote Code Execution.

Analysis

Stack overflow in HMS Networks Ewon Flexy/Cosy+ firmware.

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Remediation

Within 24 hours: Inventory all Ewon Flexy and Cosy+ devices in your environment and document firmware versions; isolate affected devices to restricted network segments if operationally feasible. Within 7 days: Contact HMS Networks for patch timelines; implement network-based access controls restricting internet-facing exposure of these gateways; enable security monitoring and logging on affected devices. …

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Priority Score

49
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +49
POC: 0

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CVE-2026-25823 vulnerability details – vuln.today
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