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

Status: published. Published: 2026-09-29. Updated: 2026-11-04.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Eclipse Foundation / Eclipse ThreadX NetX Duo: ≥ 6.0; ≤ 6.5.2.202603a (affected, custom); 6.5.2.202603b (unaffected, custom). Source: CNA: eclipse

## Severity and prioritization

- CVSS 4.0: 6 (medium); 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; source: CNA: eclipse

- CVSS 4.0: 6 (medium); 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: emo@eclipse.org

- CISA KEV: No listing in collected sources

- EPSS: 0.20% as of 2026-11-03; percentile 9.45%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-923

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-r2qx-83vg-xqx4 (CNA: eclipse)

- https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-r2qx-83vg-xqx4 (emo@eclipse.org)

## Provenance

- CNA: eclipse: https://www.cve.org/CVERecord?id=CVE-2026-102727; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-102727; retrieved 2026-11-04; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-102727; retrieved 2026-11-04; source updated Not reported

Revision: b013d3db1c6bdcaf9c103c04b213798325164ddead774d470b4a94c577abdfc5

Canonical: https://y2.dev/cve/CVE-2026-102727

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