6.9 Medium

CVE-2026-106465 Missing HelloVerifyRequest cookie validation in the NetX Secure DTLS server

Description

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.

CVSS 4.0 detail

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

Exploitable remotely over the network, without an account and without any user action; with no direct impact on the vulnerable system.

Attack vector: Network
Attack complexity: Low
Attack requirements: None
Privileges required: None
Interaction: None
Confidentiality: None
Integrity: None
Availability: None
Confidentiality of other systems: None
Integrity of other systems: None
Availability of other systems: Low

Affected products and versions

Product	Affected versions	Fixed in
NetX Duo 6.5	earliest → 6.5.2.202603	6.5.2.202603a
Eclipse ThreadX NetX Duo 6.5	earliest → < 6.5.2.202603a	6.5.2.202603a
Eclipse ThreadX NetX Duo 6.0	6.0 → 6.5.2.202603	No fix stated

References

github.com github.com
gitlab.eclipse.org gitlab.eclipse.org

Timeline

Published October 14, 2026
Last modified November 4, 2026

The 32 CVEs of NetX Duo →

CVE-2026-106464 Out-of-bounds read via an empty signature BIT STRING in NetX Secure X.509 parsing 8.7 High CVE-2026-103415 When a TLS 1.3 client processes a HelloRetryRequest, it copies the server's cookie into its second ClientHello without… 9.3 Critical CVE-2026-102717 MQTT WebSocket setter ABI mismatch may disclose memory or cause a crash 7.5 High CVE-2026-102727 FTP Passive Data Connection Not Bound to the Authenticated Control Peer 6.0 Medium

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