20817 : FileZilla Server Terminal USER Command Overflow
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Disclosure Date


A remote overflow exists in FileZilla Server. The application fails to perform proper bounds checking resulting in a buffer overflow. With a specially crafted request containing an overly long string to the 'USER' command, a remote attacker can crash the terminal process resulting in a loss of availability.


Location: Remote / Network Access
Attack Type: Input Manipulation
Impact: Loss of Integrity, Loss of Availability
Solution: Upgrade
Exploit: Exploit Public


Upgrade to version 0.9.5 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.


Tim Kosse
FileZilla Server


Tools & Filters



  • Inge Henriksen - inge.henriksenbooleansoft.com -

CVSSv2 Score

CVSSv2 Base Score = 7.8
Source: nvd.nist.gov | Generated: 2005-11-18 | Disagree?

Access_vector_2 Access_complexity_2 Authentication_2 Confidentiality_impact_0 Integrity_impact_0 Availability_impact_2


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