By default, PFTP installs with a default unpassworded account. The "/" (no quotes) account has no password set, which is publicly known and documented. This allows attackers to trivially access the program or system.
Classification
Location:
Remote / Network Access
Attack Type:
Authentication Management
Impact:
Loss of Integrity
Exploit:
Exploit Public
Solution
Upgrade to version 2.9g or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.