Executive Summary

This Alert is flagged as TOP 25 Common Weakness Enumeration from CWE/SANS. For more information, you can read this.
Title ZyXEL NBG-418N router uses default credentials and is vulnerable to cross-site request forgery
Name VU#330000 First vendor Publication 2015-12-10
Vendor VU-CERT Last vendor Modification 2015-12-10
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:M/Au:N/C:C/I:C/A:C)
Cvss Base Score 9.3 Attack Range Network
Cvss Impact Score 10 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


Vulnerability Note VU#330000

ZyXEL NBG-418N router uses default credentials and is vulnerable to cross-site request forgery

Original Release date: 10 Dec 2015 | Last revised: 10 Dec 2015


ZyXEL NBG-418N router, firmware version 1.00(AADZ.3)C0, uses default credentials and is vulnerable to cross-site request forgery.


CWE-255: Credentials Management - CVE-2015-7283

The ZyXEL NBG-418N web administration interface uses non-random default credentials of admin:1234. A local area network attacker can gain privileged access to a vulnerable device's web management interfaces or leverage default credentials in remote attacks such as cross-site request forgery.

CWE-352: Cross-Site Request Forgery (CSRF) - CVE-2015-7284

The ZyXEL NBG-418N contains a global CSRF vulnerability. An attacker can perform actions with the same permissions as a victim user, provided the victim has an active session and is induced to trigger the malicious request. Note that in combination with default credentials, an attacker can establish an active session as part of an attack and therefore would not require a victim to be logged in.

The CVSS score below reflects CVE-2015-7282.


A remote, unauthenticated attacker may be able to execute arbitrary script in the context of the end-user's browser session or perform actions as an authenticated user. A local area network attacker can take complete control of a device using default admin credentials.


The CERT/CC is currently unaware of a practical solution to this problem. Until these vulnerabilities are addressed, users should consider the following workarounds.

Restrict access and use strong passwords

As a general good security practice, only allow trusted hosts to connect to the LAN. Implement strong passwords for WiFi and for the web management interface. Strong passwords can help to prevent blind guessing attempts that would establish sessions for CSRF attacks. LAN hosts should not browse the Internet while the web management interface has an active session in a browser tab.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate Updated
ZyXELAffected08 Oct 201510 Dec 2015
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)



  • http://www.zyxel.com/us/en/support/download_library/product/nbg_418n_7.shtml?c=us&l=en&pid=20120320173444&tab=Firmware


These vulnerabilities were reported by Joel Land of the CERT/CC.

This document was written by Joel Land.

Other Information

  • CVE IDs:CVE-2015-7283CVE-2015-7284
  • Date Public:10 Dec 2015
  • Date First Published:10 Dec 2015
  • Date Last Updated:10 Dec 2015
  • Document Revision:7


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/330000

CWE : Common Weakness Enumeration

% Id Name
33 % CWE-352 Cross-Site Request Forgery (CSRF) (CWE/SANS Top 25)
33 % CWE-255 Credentials Management
33 % CWE-20 Improper Input Validation

CPE : Common Platform Enumeration

Hardware 1
Hardware 1
Os 1
Os 1

Alert History

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Date Informations
2016-01-01 05:27:01
  • Multiple Updates
2016-01-01 00:28:00
  • Multiple Updates
2015-12-31 09:27:31
  • Multiple Updates
2015-12-10 17:23:18
  • First insertion