6.0 Medium

CVE-2026-102727 FTP Passive Data Connection Not Bound to the Authenticated Control Peer

Description

In Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603a, the FTP server accepts the first connection to a passive data port without checking that it comes from the client that requested passive mode. An unauthenticated network attacker who connects to the predictable port first receives the file an authenticated user downloads, or supplies the content of the file the user uploads.

CVSS 4.0 detail

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

Exploitable remotely over the network, without an account and if a user takes an action; an attacker can seriously compromise confidentiality, integrity or availability.

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