CVE-2025-0728: Eclipse ThreadX NetX Duo HTTP server single PUT request integer underflow

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-191

Description

In NetX HTTP server functionality of Eclipse ThreadX NetX Duo before version 6.4.2, an attacker can cause an integer underflow and a subsequent denial of service by writing a very large file, by specially crafted packets with Content-Length smaller than the data request size. A possible workaround is to disable HTTP PUT 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-hqp7-4q26-6wqf

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