CVE-2026-129444
Deferred Deferred - Pending Action

Hard-Coded Credentials in D-Link DSL-6740C Firmware

Publication date: 2026-11-15

Last updated on: 2026-11-15

Assigner: VulDB

Description
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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Meta Information

Published
2026-11-15
Last Modified
2026-11-15
Generated
2026-11-15
AI Q&A
2026-11-15
EPSS Evaluated
N/A
NVD
CVE-2026-129444
EUVD
EUVD-2026-126003

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
D-Link DSL-6740C 20131126

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-798 The product contains hard-coded credentials, such as a password or cryptographic key.
CWE-259 The product contains a hard-coded password, which it uses for its own inbound authentication or for outbound communication to external components.

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Executive Summary

This vulnerability involves a D-Link DSL-6740C router where the FTP daemon starts by default during boot. The FTP configuration file contains hard-coded credentials, including an 'anonymous' account with full permissions and a 'test' account with username 'test' and password 'test'. The FTP server listens on all network interfaces without restrictions, allowing remote access.

Detection Guidance

Check if the D-Link DSL-6740C device has an FTP daemon running on port 21. Use commands like 'nmap -p 21 <device_IP>' to scan for open FTP ports. Verify if the FTP configuration file '/etc/templates/ftpd/ftpd_conf.php' contains default accounts like 'anonymous' or 'test' with password 'test'.

Impact Analysis

Attackers can remotely exploit this vulnerability to gain unauthorized access to the router's FTP service. They could then read, modify, or delete sensitive files, upload malicious content, or use the device as a pivot point for further attacks. The 'test' account allows login, while incorrect passwords are rejected, making brute-force attacks unnecessary.

Compliance Impact

This vulnerability likely violates compliance requirements for data protection and network security. It exposes sensitive data to unauthorized access, which could lead to breaches of GDPR (data protection) and HIPAA (healthcare data). Organizations using this device may face legal penalties and reputational damage.

Mitigation Strategies

Disable the FTP daemon on the D-Link DSL-6740C device if not needed. Change default credentials for any existing FTP accounts. Restrict FTP access to trusted IP addresses if FTP must remain enabled. Update the device firmware if a patch is available.

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