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Synology NAS servers contain insecure default credentials

Vulnerability Note VU#404187

Original Release Date: 2016-10-20 | Last Revised: 2016-10-20


Synology NAS servers DS107, DS116, and DS213, use default credentials.


CWE-255: Credentials Management - CVE-2016-6554

Synology NAS servers DS107, firmware version 3.1-1639 and prior, and DS116, DS213, firmware versions prior to 5.2-5644-1, use non-random default credentials of: guest:(blank) and admin:(blank) . A remote network attacker can gain privileged access to a vulnerable device.


A remote attacker can take complete control of a device using default admin credentials.


Apply an Update

Firmware version 5.2-5644-1 for the DS116 and DS213 will require a strong password for the default admin account.
For the DS107 and for guest accounts, implement the following workarounds.

Disable Default Accounts

The latest firmware versions for all affected devices allow the default guest account to be disabled.
The latest firmware for the DS116 and DS213 allow the default admin account to be disabled.

Use strong passwords

Use of strong, unique passwords can help reduce the efficacy of brute force password guessing attacks.

Restrict access

As a general good security practice, only allow trusted hosts to connect to the device.

Vendor Information


Synology Affected

Notified:  October 12, 2016 Updated: October 13, 2016



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group Score Vector
Base 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C
Temporal 6.2 E:F/RL:W/RC:ND
Environmental 4.7 CDP:N/TD:M/CR:ND/IR:ND/AR:ND



Thanks to Ory Segal and Ezra Caltum for reporting this vulnerability.

This document was written by Trent Novelly.

Other Information

CVE IDs: CVE-2016-6554
Date Public: 2016-10-20
Date First Published: 2016-10-20
Date Last Updated: 2016-10-20 18:15 UTC
Document Revision: 15

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