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CVE-2026-25819

HIGH
7.5
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
HIGH7.5
Exploit prediction
EPSS 0.5%
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 allows unauthenticated attackers to cause a Denial of Service by using a specially crafted HTTP request that leads to a reboot of the device, provided they have access to the device's GUI.

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 exploitAutomatablePartial impact

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

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-400

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