Denial of Service Vulnerability in FileZilla by Tim Kosse
CVE-2019-25683

6.9MEDIUM

Key Information:

Vendor

Filezilla-project

Status
Filezilla
Vendor
CVE Published:
5 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2019-25683?

FileZilla 3.40.0 is vulnerable to a denial of service issue stemming from its local search functionality. A local attacker can exploit this vulnerability by inputting a specially crafted path string, specifically one that consists of 384 'A' characters followed by sequences 'BBBB' and 'CCCC'. This manipulation can lead to the application crashing during a local search operation, impacting the usability of the software and potentially disrupting user activities.

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Affected Version(s)

FileZilla 3.40.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2019-25683 - Proof of Concept

References

https://www.exploit-db.com/exploits/46484
exploit
https://filezilla-project.org
product
https://www.vulncheck.com/advisories/filezilla-denial-of-...
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mr Winst0n
JSON
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