D-Link DCS-1100/DCS-1130 Base64 Encoding UDP Packet credentials management

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.

A vulnerability was found in D-Link DCS-1100 and DCS-1130 (version now known). It has been declared as critical. Affected by this vulnerability is some unknown processing of the component Base64 Encoding. The manipulation as part of a UDP Packet leads to a credentials management vulnerability. The CWE definition for the vulnerability is CWE-255. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered on D-Link DCS-1100 and DCS-1130 devices. The device requires that a user logging into the device provide a username and password. However, the device allows D-Link apps on the mobile devices and desktop to communicate with the device without any authentication. As a part of that communication, the device uses custom version of base64 encoding to pass data back and forth between the apps and the device. However, the same form of communication can be initiated by any process including an attacker process on the mobile phone or the desktop and this allows a third party to retrieve the device's password without any authentication by sending just 1 UDP packet with custom base64 encoding. The severity of this attack is enlarged by the fact that there more than 100,000 D-Link devices out there.

The weakness was published 07/02/2019 as not defined mailinglist post (Bugtraq). The advisory is shared at seclists.org. This vulnerability is known as CVE-2017-8417 since 05/02/2017. Access to the local network is required for this attack to succeed. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/15/2023). MITRE ATT&CK project uses the attack technique T1552 for this issue.

Proper firewalling of is able to address this issue.





CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍


VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.5

VulDB Base Score: 6.3
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Credentials management
CWE: CWE-255

Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Firewall
Status: 🔍

0-Day Time: 🔍


05/02/2017 🔍
07/02/2019 +791 days 🔍
07/03/2019 +1 days 🔍
10/15/2023 +1565 days 🔍


Vendor: dlink.com

Advisory: 153226
Status: Not defined

CVE: CVE-2017-8417 (🔍)


Created: 07/03/2019 07:32 AM
Updated: 10/15/2023 12:34 PM
Changes: 07/03/2019 07:32 AM (41), 06/29/2020 09:10 PM (17), 10/15/2023 12:34 PM (4)
Complete: 🔍
Cache ID: 44:6A9:40


No comments yet. Languages: en.

Please log in to comment.

Do you know our Splunk app?

Download it now for free!