CVE-2026-25823
Received Received - Intake
Stack Buffer Overflow in HMS Networks Ewon Flexy Causes DoS, RCE

Publication date: 2026-03-13

Last updated on: 2026-03-13

Assigner: MITRE

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.
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Meta Information
Published
2026-03-13
Last Modified
2026-03-13
Generated
2026-06-16
AI Q&A
2026-03-13
EPSS Evaluated
2026-06-15
NVD
CVE-2026-25823
EUVD
EUVD-2026-11715
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
hms_networks ewon_flexy to 15.0s4 (exc)
hms_networks cosy to 22.1s6 (exc)
hms_networks cosy to 23.0s3 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
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Executive Summary

This vulnerability affects HMS Networks Ewon Flexy and Cosy+ devices with certain firmware versions. It is a stack buffer overflow that can cause a Denial of Service (DoS). Additionally, it can be exploited to achieve Unauthenticated Remote Code Execution, meaning an attacker can run arbitrary code on the device without needing to authenticate.

Impact Analysis

The vulnerability can lead to a Denial of Service, making the affected devices unavailable or unresponsive. More critically, it allows an attacker to execute code remotely without authentication, which can compromise the device's integrity, confidentiality, and availability.

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