---
id: "CVE-2026-129444"
page: "https://infrastack.ai/live/CVE-2026-129444"
kind: "vulnerability"
aliases: ["CVE-2026-129444"]
title: "D-Link DSL-6740C router: hard-coded credentials in FTP daemon config"
severity: "critical"
cvss: 10.0
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "DSL-6740C firmware", "fixed": [], "affected": "20131126 (Rev.A S5/N5 TR069 build)", "ecosystem": "vendor"}]
ecosystems: []
tags: ["d-link", "dsl-6740c", "end-of-life", "ftp", "hard-coded-credentials", "home-router", "infrastructure"]
not_affected_if: ["firmware-updated", "ftp-not-exposed", "other-hardware"]
published_at: "2026-11-15T09:16:44+00:00"
first_seen_at: "2026-11-15T09:34:41+00:00"
updated_at: "2026-11-15T09:35:36+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-129444", "first_seen_at": "2026-11-15T09:34:41+00:00"}, {"source": "analyst", "url": "https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10414", "first_seen_at": "2026-11-15T09:35:36+00:00", "cites": ["https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10414", "https://vuldb.com/vuln/437457"]}]
exploit_sources: []
---

# D-Link DSL-6740C router: hard-coded credentials in FTP daemon config

Link for people: https://infrastack.ai/live/CVE-2026-129444 (this .md is for agents)

The D-Link DSL-6740C router firmware (version 20131126) ships with hard-coded credentials in its FTP daemon configuration file. A remote attacker can use those credentials to access the device, and a public exploit is available.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:DSL-6740C firmware affected 20131126 (Rev.A S5/N5 TR069 build) fixed no fixed version listed

## How to check

- Applies to DSL-6740C ADSL2+ router (Rev.A) S5/N5 TR069 builds dated 20131126 (per the VulDB submission). Compare the firmware build in the admin page.
- From outside your network, check whether the router answers on FTP (TCP 21). Do not test with the built-in credentials on devices you do not own.
- Also check other DSL-6740C builds you run (for example ISP-supplied v6.TR069.20211230): the sources do not say whether they carry this file.

## Fix

No fix: D-Link lists the DSL-6740C (all hardware revisions) as end-of-life/end-of-service since no later than 15 Jan 2024 (SAP10414) and recommends replacing it. No firmware fix for this CVE is known.

## Timeline

- 2026-11-15T09:34:41+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-129444
- 2026-11-15T09:35:36+00:00 analyst https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10414 — Primary: D-Link has no fix: SAP10414 says DSL-6740C is EOL/EOS (Jan 2024), though that page covers a different CVE. VulDB (VDB-437457) says PoC on GitHub (link not visible, so not saved) and no exploitation in the wild is reported. Not verified: no vendor advisory for this CVE, so nothing marked verified. Open: FTP enabled by default unknown. Could not confirm the 20131126 build vs other firmware.

## Documents

- [advisory] D-Link SAP10414: DSL-6740C EOL/EOS announcement https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10414
- [describes] VulDB VDB-437457: DSL-6740C 20131126 ftpd_conf.php hard-coded credentials https://vuldb.com/vuln/437457

## From the sources

A vulnerability was identified in D-Link DSL-6740C 20131126. This affects an unknown function of the file /etc/templates/ftpd/ftpd_conf.php of the component FTP Daemon. Such manipulation leads to hard-coded credentials. The attack can be executed remotely. The exploit is publicly available and might be used.

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