CVE-2026-25818
Weak Entropy in HMS Networks Ewon Flexy Authentication Cookies
Publication date: 2026-03-13
Last updated on: 2026-03-13
Assigner: MITRE
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| hms_networks | cosy_plus | to 22.1s6 (exc) |
| hms_networks | cosy_plus | to 23.0s3 (exc) |
| hms_networks | ewon_flexy | to 15.0s4 (exc) |
| hms_networks | cosy | to 22.1s6 (exc) |
| hms_networks | cosy | to 23.0s3 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-315 | The product stores sensitive information in cleartext in a cookie. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability affects HMS Networks Ewon Flexy and Cosy+ devices with certain firmware versions. The issue is that these devices use weak entropy for authentication cookies. Because of this weakness, an attacker who has stolen a session cookie can brute-force an encryption parameter to discover the user's password.
How can this vulnerability impact me? :
The vulnerability can have a severe impact because it allows an attacker to obtain the user password by brute-forcing an encryption parameter after stealing a session cookie. This can lead to unauthorized access with high confidentiality and integrity impact, as indicated by the CVSS score of 9.1.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know