Zero-Day Advisory

Fortinet Discovers MSRawImage Store Stack-Based Buffer Overwrite Vulnerability


Fortinet's FortiGuard Labs has discovered a stack-based buffer overwrite vulnerability in Microsoft Raw Image Extension.

The Raw Image Extension adds native viewing support for images captured in raw file formats produced by many mid- to high-end digital cameras

The stack-based buffer overwrites memory write vulnerability exists due to unsanitized user-controlled data crafted in a raw image file parsed by a vulnerable component. An attacker who successfully exploited the vulnerability could obtain remote code execution on the user's system.


Users should apply the solution provided by Microsoft.


Fortinet reported the vulnerability to Microsoft on July 30, 2020

Microsoft confirmed the vulnerability on July 31, 2020

Microsoft released a patch for the vulnerability on November 11, 2020


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.