CVE-2025-2258: Eclipse Threadx Netx Duo

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

In NetX Duo component HTTP server functionality of Eclipse ThreadX NetX Duo before version 6.4.3, 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. This issue follows an uncomplete fix in CVE-2025-0728.

Affected products

• Eclipse Threadx Netx Duo: before 6.4.3 (fixed in 6.4.3)

Published 2025-04-06. Last modified 2026-06-17.