Executive Summary

Title Synology NAS servers contain insecure default credentials
Name VU#404187 First vendor Publication 2016-10-20
Vendor VU-CERT Last vendor Modification 2016-10-20
Severity (Vendor) N/A Revision M

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score 10 Attack Range Network
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


Vulnerability Note VU#404187

Synology NAS servers contain insecure default credentials

Original Release date: 20 Oct 2016 | Last revised: 20 Oct 2016


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 (Learn More)

VendorStatusDate NotifiedDate Updated
SynologyAffected12 Oct 201613 Oct 2016
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)



  • http://cwe.mitre.org/data/definitions/255.html
  • https://www.synology.com/en-global/releaseNote/DS213
  • https://www.akamai.com/us/en/multimedia/documents/state-of-the-internet/sshowdown-exploitation-of-iot-devices-for-launching-mass-scale-attack-campaigns.pdf


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:20 Oct 2016
  • Date First Published:20 Oct 2016
  • Date Last Updated:20 Oct 2016
  • Document Revision:14


If you have feedback, comments, or additional information about this vulnerability, please send us email.

Original Source

Url : http://www.kb.cert.org/vuls/id/404187

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-255 Credentials Management

CPE : Common Platform Enumeration

Os 1
Os 1
Os 1

Alert History

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Date Informations
2018-09-08 00:21:46
  • Multiple Updates
2018-07-14 00:21:04
  • Multiple Updates
2016-10-20 21:21:52
  • First insertion