Zero-Day Advisory

Fortinet Discovers Oracle VirtualBox Denial of Service Vulnerability


Fortinet's FortiGuard Labs has discovered a Denial of Service (DoS) vulnerability in Oracle VirtualBox.

Oracle VirtualBox is a cross-platform virtualization application.

A DoS vulnerability has been discovered in Oracle VirtualBox versions prior to 5.2.26 and 6.0.4. It exists because VirtualBox fails to handle a crafted TCP session sent from a Virtual Machine (VM), which will cause all the VMs in the VirtualBox can't connect the network.


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

Released Jan 11, 2019
Users should apply the solution provided by Oracle.


Fortinet reported the vulnerability to Oracle on December 6, 2018.

Oracle confirmed the vulnerability on January 11, 2019.

Oracle patched the vulnerability on January 28, 2019.


This vulnerability was discovered by Zhouyuan Yang 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.