Zero-Day Advisory

Fortinet Discovers Windows Message Queuing Message Header Out-of-bounds Write Vulnerability


Fortinet's FortiGuard Labs has discovered an out-of-bounds write vulnerability in the Message Queuing service of Microsoft Windows.

The vulnerability could potentially lead to unauthenticated remote code execution in the Message Queuing service due to the lack of bound check when reading user-controlled section size.


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

Released Apr 06, 2023

Users should apply the solution provided by Microsoft.


Fortinet reported the vulnerability to Microsoft on February 14, 2023

Microsoft confirmed the vulnerability on February 17, 2023

Microsoft released a patch for the vulnerability on April 11, 2023


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.