Zero-Day Advisory

Fortinet Discovers Bitdefender Self-Protection Bypass Vulnerability


Fortinet's FortiGuard Labs has discovered a security bypass issue in Bitdefender.

Bitdefender is an Anti-Virus product for business and personal use. It's developed by Bitdefender company.

The security bypass issue has been discovered in Bitdefender's security products particularly in one of its kernel driver components gzflt.sys. This kernel driver component is responsible in protecting Bitdefender's critical files and registries. The security bypass issue allows attackers to evade the self-protection and subsequently allows the attackers to disable the protection completely.


Users should apply the solution provided by Bitdefender.

Additional Information

Fortinet reported the vulnerability to Bitdefender on March 22, 2017.

Bitdefender patched the vulnerability on July 4, 2017.


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.