6.9 Medium

CVE-2026-102722 The FTP client trusts arbitrary IP addresses in the PASV server response

Description

In Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603a, the FTP client in IPv4 passive mode opens its data connection to whatever address the server names in its 227 reply instead of the server it is talking to. A malicious FTP server can make the client connect to any host and port the device can reach, using it to scan the internal network and to deliver uploads to internal services.

CVSS 4.0 detail

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

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: Low
Integrity of other systems: Low
Availability of other systems: None

Affected products and versions

Product	Affected versions	Fixed in
NetX Duo 6.5	earliest → 6.5.1.202602	No fix stated
Eclipse ThreadX NetX Duo 6.5	earliest → < 6.5.2.202603b	6.5.2.202603b
Eclipse ThreadX NetX Duo 6.0	6.0 → 6.5.2.202603a	No fix stated

References

github.com github.com

Timeline

Published September 29, 2026
Last modified November 4, 2026

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