---
id: CVE-2026-115215
title: >-
  NetX Secure DTLS server allocates a session for each new source before the
  cookie exchange and never reclaims it, so spoofed datagrams exhaust the
  session pool
summary: >-
  In Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603a, the NetX
  Secure DTLS server allocates a session from its fixed session pool for the
  first datagram from any unrecognised address and port, before the cookie
  exchange, and ne…
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-770
  - CWE-772
vendor: Eclipse Foundation
product: Eclipse ThreadX
affected:
  - eclipse_threadx >= 6.0 <= 6.5.2.202603a
published: '2026-11-02'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T21:43:53.639Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115215'
references:
  - url: >-
      https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-3p2g-x7hh-3w4c
  - url: 'https://gitlab.eclipse.org/security/cve-assignment/-/work_items/487'
tags:
  - cve.org
epss: 0.00412
epssPercentile: 0.35627
ingestedAt: '2026-11-05T19:30:42.861Z'
---

## Overview

In Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603a, the NetX Secure DTLS server allocates a session from its fixed session pool for the first datagram from any unrecognised address and port, before the cookie exchange, and never releases a session whose handshake stalls. A remote, unauthenticated attacker can exhaust the pool with one spoofed datagram per source and deny DTLS service to legitimate clients until the application resets the sessions.

## Affected

- `eclipse_threadx >= 6.0 <= 6.5.2.202603a`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.