Zero-Day Advisory

Fortinet Discovers MalwareBytes Arbitrary File Deletion Vulnerability


Fortinet's FortiGuard Labs has discovered an Arbitrary File Deletion vulnerability in MalwareBytes.

Malwarebytes is an anti-malware software which is developed by Malwarebytes Corporation.

An Arbitrary File Deletion vulnerability has been discovered in MalwareBytes by FortiGuard Labs. This vulnerability exists in its file quarantine mechanism because the vulnerable application fails to verify if the target file is a symbolic link before deleting it. It could allow malicious users to delete any existing file on the system.


Users should apply the solution provided by MalwareBytes.

Additional Information

Fix versions:

  • Endpoint Protection:
  • Endpoint Protection Protection Update: 1.0.34371
  • Protection Service Version:
  • Component Package version: 1.0.1126


Fortinet reported the vulnerability to MalwareBytes on September 3, 2020.

MalwareBytes confirmed the vulnerability on November 1, 2020.

MalwareBytes patched the vulnerability on December 10, 2020.


This vulnerability was discovered by Ben Hunter 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.