Zero-Day Advisory

Fortinet Discovers Netgear WAN DNS Stack Buffer Overflow in SOAP Handler


Fortinet's FortiGuard Labs has discovered post authentication 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

The routers suffer stack-based buffer overflow vulnerability that can be triggered when arbitrary WAN DNS is sent to CGI handler and later the said DNS setting is retrieved via SOAP request


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

Released Jul 02, 2018

Users should apply latest update from the vendor


Fortinet reported the vulnerability to Netgear on 31, May 2018

Netgear confirmed the vulnerability on 14, July 2018

Netgear released patch for the vulnerability on 04, September 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.