Zero-Day Advisory

Fortinet Discovers Microsoft Windows Imaging Library UncompressFile Memory Corruption


Fortinet's FortiGuard Labs has discovered memory out-of-bound write on Microsoft Windows Imaging Library.

Microsoft Windows Imaging Library is a file-based disk image format. It was developed by Microsoft to help deploy Windows Vista and subsequent versions of the Windows operating system family, as well as Windows Fundamentals for Legacy PCs.[3]

The vulnerability in the Microsoft Windows Imaging Library allows remote code execution when the victim open a specially crafted Windows Imaging file.


Users should apply the solution provided by Microsoft.


Fortinet reported the vulnerability to Microsoft on November 11, 2019

Microsoft confirmed the vulnerability on December 03, 2019

Microsoft released patch for the vulnerability on February 11 13, 2019.


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.