CVE-2019-25683 Filezilla Project CVE debrief

Who should care

Users of FileZilla Client version 3.40.0 should apply patches or mitigations to prevent local denial of service attacks. This vulnerability has a medium priority due to the local attack vector and potential for service disruption. Operators of FileZilla Client version 3.40.0, platform administrators, and security teams should review the vulnerability and apply necessary patches or mitigations.

Technical summary

FileZilla 3.40.0 contains a denial of service vulnerability in the local search functionality. Local attackers can crash the application by supplying a malformed path string. The crash can be triggered by entering a crafted path containing 384 'A' characters followed by 'BBBB' and 'CCCC' sequences in the search directory field and initiating a local search operation. The vulnerability is due to improper handling of the path string. The affected product is FileZilla Client version 3.40.0.

Defensive priority

Medium priority due to local attack vector and potential for service disruption. Operators should prioritize patching and implement compensating controls.

Recommended defensive actions

• Apply patches or updates from the vendor
• Implement compensating controls such as monitoring for abnormal application behavior
• Restrict local access to the application
• Consider using alternative file transfer clients
• Review and update vulnerability management processes
• Monitor for exploitation attempts
• Perform regular security audits

Evidence notes

The CVE record was published on 2026-04-05T21:16:46.800Z and was last modified on 2026-07-24T22:10:00.140Z. The NVD entry is currently Analyzed. This information is based on the NVD entry and the CVE record. The vulnerability affects FileZilla Client version 3.40.0. There is no evidence of exploitation in the wild. However, defenders should verify the patch status of their FileZilla deployments and monitor for abnormal application behavior.

Official resources