What’s Vulnerable › Vulnerabilities

CVE-2025-2259: Eclipse ThreadX NetX Duo component HTTP server single PUT request integer underflow

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-06 · updated 2026-06-17
• Weakness: CWE-191

Description

In NetX 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 in one packet smaller than the data request size of the other packet. A possible workaround is to disable HTTP PUT support. This issue follows an incomplete fix of CVE-2025-0727

Affected products

• Eclipse Foundation NetX Duo: before 6.4.3 — fixed in 6.4.3

How to fix

Upgrade to a fixed version: Eclipse Foundation NetX Duo 6.4.3. Check the vendor advisory for mitigations.

References

• https://github.com/eclipse-threadx/netxduo/commit/fb3195bbb6d0d6fe71a7a19585c008623c217f9e
• https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-chhp-gmxc-46rq
• https://www.talosintelligence.com/vulnerability_reports/TALOS-2024-2104

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