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CVE-2026-25817

HIGH
8.8
CVSS Score
Published: March 12, 2026 at 12:00 AM UTC
Updated: June 17, 2026 at 10:25 AM UTC
2 products affected across 1 vendorEwon FlexyEwon Cosy Plus

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Severity
HIGH8.8
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

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 improper neutralization of special elements used in an OS command allowing remote code execution by attackers with low privilege access on the gateway, provided the attacker has credentials.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ewon Cosy Plus· Hms Networks
90%
22.0 ≤ v < 22.1s623.0 ≤ v < 23.0s3
Ewon Flexy· Hms Networks
90%
v < 15.0s4

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Source: cverecord
https://www.hms-networks.com/p/flexy20500-00ma-ewon-flexy-205
Source: cverecord
https://hmsnetworks.blob.core.windows.net/nlw/docs/default-source/products/cybersecurity/security-advisory/hms-security-advisory-2026-03-09-001---ewon-several-flexy-and-cosy--vulnerabilities.pdf?sfvrsn=f7c027b8_13

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-94

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