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PatchSiren cyber security CVE debrief

CVE-2019-25683 Filezilla Project CVE debrief

CVE-2019-25683 is a denial of service vulnerability in the local search functionality of FileZilla 3.40.0. This vulnerability allows local attackers to 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 has a CVSS score of 6.9 and a severity of MEDIUM. Users of FileZilla Client version 3.40.0 should apply patches or mitigations to prevent local denial of service attacks.

Vendor
Filezilla Project
Product
Filezilla Client
CVSS
MEDIUM 6.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-05
Original CVE updated
2026-07-24
Advisory published
2026-04-05
Advisory updated
2026-07-24

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2019-25683 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2019-25683

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2019-25683 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2019-25683

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.