Zero-Day Advisory

Fortinet Discovers D-Link DIR-866L Cross-Site Scripting Vulnerability


Fortinet's FortiGuard Labs has discovered a Cross-Site Scripting vulnerability in D-Link products.

D-Link is a global leader in the design, manufacture and marketing of advanced networking, broadband, digital, voice and data communications solutions

We discovered a wide range of D-Link products that are vulnerable to cross-site scripting vulnerability. These products include but not limited to DIR-866L. The issue occurs when the attacker send an arbitrary input to the device common gateway interface that could lead to common injection. Attacker who successfully trigger the vulnerability could result in arbitrary code execution in user browser context.


FortiGuard Labs released the following FortiGate IPS signature which covers this specific vulnerability:


The affected product is End-of-Life (EOL). Users should follow the guidance released by the vendor

Additional Information

Fortinet reported the vulnerability to D-Link on 22 September, 2019. 

D-Link confirmed the vulnerability on 23 September, 2019. 

D-Link confirmed these products are EOL on 25 September, 2019.


This vulnerability was discovered by Nguyen Thanh Nguyen of Fortinet's FortiGuard Labs.

IPS Subscription

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be protected against this vulnerability with the appropriate configuration parameters in place. Fortinet's IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by FortiGuard Labs, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.