Authentication Bypass by Spoofing in NetX Duo - CVE-2026-106465
Published: November 9, 2026
Vulnerability identifier: #VU162965
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-106465
CWE-ID: CWE-290
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to reflect amplified DTLS handshake traffic toward a third party, reducing the victim's network availability.
The vulnerability exists due to missing cookie validation in the NetX Secure DTLS server in NetX Duo, which accepts any nonempty cookie in a ClientHello. An unauthenticated remote attacker can send an initial ClientHello with a one-byte cookie and a forged victim source address to trigger the server's full handshake response.
Affected software
NetX Duo
How to mitigate CVE-2026-106465
Install security update from vendor's website.
NetX Duo - update to 6.5.2.202603