Zero-Day Advisory

Fortinet Discovers Netgear R8500 Stack Buffer Overflow in ASP Handler


Fortinet's FortiGuard Labs has discovered post-authentication stack buffer overflow vulnerability in Netgear Routers.

Netgear is a global computer networking company based in San Jose, California, in the United States. It produces networking hardware for consumers, businesses, and service providers

There is stack buffer overflow issue in ef_get_wireless_security Active Server Page (ASP) handler. The ASP handler does not assess the length of the WPA/WPA2 password when it was set by attacker through Common Gateway Interface (CGI) script.


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

Released May 11, 2018

Users should apply the latest update from the vendor


Fortinet reported the vulnerability to Netgear on 27, April 2018

Netgear confirmed the vulnerability on 28, April 2018

Netgear released patch for the vulnerability on 11, March 2019


This vulnerability was discovered by Wayne Low 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.