Zero-Day Advisory

Fortinet Discovers VMware vCenter Server Remote DoS Vulnerability


Fortinet's FortiGuard Labs has discovered a Denial of Service vulnerability in VMware VCenter Server.

VMware VCenter Server is a data center management server application developed by VMware Inc. to monitor virtualized environments. VCenter Server provides centralized management and operation, resource provisioning and performance evaluation of virtual machines residing on a distributed virtual data center. VCenter Server is designed primarily for VSphere, VMware's platform for building virtualized cloud infrastructures.

A Denial of Service vulnerability has been discovered in VMware VCenter Server. It exists because vCenter Server doesn't correctly handle specially crafted LDAP network packets which may allow for remote DoS.


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

Released Apr 11, 2017

Users should apply the solution provided by VMware.

Additional Information

Fortinet reported the vulnerability to VMware on January 26, 2017.

VMware confirmed the vulnerability on April 6, 2017.

VMware released patch for the vulnerability on November 9, 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.