Zero-Day Advisory

Fortinet Discovers Microsoft Windows Code Integrity Module Denial of Service Vulnerability


Fortinet's FortiGuard Labs has discovered a Denial of Service vulnerability in Microsoft Windows Code Integrity Module.

Microsoft Windows is a group of graphical operating system families, all of which are developed and sold by Microsoft.

The Denial of Service vulnerability exists in the way that the Windows Code Integrity Module performs hashing. An attacker who successfully exploited the vulnerability could cause a system to stop responding and prevent authorized users from using system resources.


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

Released May 10, 2018

Users should apply the solution provided by Microsoft.

Additional Information

Following Windows versions are affected:

Windows 10

Windows 7

Windows 8.1

Windows RT 8.1

Windows Server 2008

Windows Server 2012

Windows Server 2016

Windows Server


Fortinet reported the vulnerability to Microsoft on January 31, 2018.

Microsoft confirmed the vulnerability on March 21, 2018.

Microsoft patched the vulnerability on June 12, 2018.


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.