Zero-Day Advisory

Fortinet Discovers EMC AppSync Host Plug-in Remote Denial of Service Vulnerability


Fortinet's FortiGuard Labs has discovered a denial of service (DoS) vulnerability in EMC AppSync Host Plug-in.

EMC AppSync is a software that enables Integrated Copy Data Management (iCDM) with Dell EMC's primary storage systems. AppSync simplifies, orchestrates, and automates the process of generating and consuming copies of production data.

EMC AppSync Host Plug-in (AppSync agent) on Windows platforms is vulnerable when processing a large amount of network packets. An unauthenticated remote attacker can send specifically crafted packets to the vulnerable service (port 10004) and cause denial of service situation.


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

Released Sep 29, 2017

Users should apply the solution provided by EMC.

Additional Information

Fortinet reported the vulnerability to EMC on June 27, 2017.

EMC confirmed the vulnerability on August 31, 2017.

EMC released patch for it on September 26, 2017.


This vulnerability was discovered by Honggang Ren 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.