CVE-2025-0726: Eclipse ThreadX NetX Duo HTTP server denial of service

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-21 · updated 2026-06-17
Weakness: CWE-459

Description

In NetX HTTP server functionality of Eclipse ThreadX NetX Duo before version 6.4.2, an attacker can cause a denial of service by specially crafted packets. The core issue is missing closing of a file in case of an error condition, resulting in the 404 error for each further file request. Users can work-around the issue by disabling the PUT request support.

Affected products

Eclipse Foundation NetX Duo: before 6.4.2 — fixed in 6.4.2

How to fix

Upgrade to a fixed version: Eclipse Foundation NetX Duo 6.4.2. Check the vendor advisory for mitigations.

References

https://github.com/eclipse-threadx/netxduo/commit/c78d650be7377aae1a8704bc0ce5cc6f9f189014
https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-pwf8-5q9w-m763

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