In Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603, the NetX Secure DTLS server never compares the cookie a client returns with the one it issued, and treats any non-empty cookie as verified. A remote attacker can make the server send its full handshake flight, several kilobytes, to a forged source address, using it to reflect amplified traffic at a third party.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact Low

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Eclipse
  • Netx Duo

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References
Link Providers
https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-7c5f-gmpm-f655 cve-icon cve-icon
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/379 cve-icon cve-icon
History

Wed, 04 Nov 2026 13:30:00 +0000

Type Values Removed Values Added
Description The NetX Secure DTLS server sends a HelloVerifyRequest carrying a freshly generated cookie, but never checks the cookie a client returns. The ClientHello parser copies the client's cookie bytes over the value the server issued, and the server then decides whether the client has been verified from the cookie's length alone. A peer that puts any single cookie byte in its first ClientHello skips the verification exchange entirely, so the server has no return-routability check and completes handshakes for forged source addresses. In Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603, the NetX Secure DTLS server never compares the cookie a client returns with the one it issued, and treats any non-empty cookie as verified. A remote attacker can make the server send its full handshake flight, several kilobytes, to a forged source address, using it to reflect amplified traffic at a third party.
Title NetX Duo DTLS Server Bypasses Cookie Validation, Enabling Forged Connections Missing HelloVerifyRequest cookie validation in the NetX Secure DTLS server
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L'}

 cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L'}

Sat, 17 Oct 2026 06:00:00 +0000

Type Values Removed Values Added
First Time appeared Eclipse
Eclipse netx Duo
Vendors & Products Eclipse
Eclipse netx Duo

Fri, 16 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 15 Oct 2026 15:45:00 +0000

Type Values Removed Values Added
Title NetX Duo DTLS Server Bypasses Cookie Validation, Enabling Forged Connections

Wed, 14 Oct 2026 18:00:00 +0000

Type Values Removed Values Added
Description The NetX Secure DTLS server sends a HelloVerifyRequest carrying a freshly generated cookie, but never checks the cookie a client returns. The ClientHello parser copies the client's cookie bytes over the value the server issued, and the server then decides whether the client has been verified from the cookie's length alone. A peer that puts any single cookie byte in its first ClientHello skips the verification exchange entirely, so the server has no return-routability check and completes handshakes for forged source addresses.
Weaknesses CWE-290
CWE-406
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L'}
cve-icon MITRE

Status: PUBLISHED

Assigner: eclipse

Published: 2026-10-14T17:47:11.013Z

Updated: 2026-11-04T13:23:55.487Z

Reserved: 2026-10-06T16:53:50.280Z

Link: CVE-2026-106465

cve-icon Vulnrichment

Updated: 2026-10-16T20:14:40.728Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-14T18:17:25.093

Modified: 2026-11-04T14:17:20.967

Link: CVE-2026-106465

cve-icon Redhat

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