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Vulnerability record · CVE-2026-25823 · published 13 March 2026

CVE-2026-25823: Stack-based buffer overflow vulnerability

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.

9.8 CVSS 3.1 Critical EPSS 0.94% · top 40.6% CWE-121 · Stack-based buffer overflow Deferred
9.8CVSS 3.1 base score
0.94%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://hmsnetworks.blob.core.windows.net/nlw/docs/default-source/products/cybersecurity/security-advisory/hms-security-
https://www.hms-networks.com/p/flexy20500-00ma-ewon-flexy-205

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Source: NIST National Vulnerability Database (record CVE-2026-25823), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.