[Zope] Security flaw in Zope FTP server?

I was running a security scanner (nessus) on my webserver tonight, and it came back with port 8021 having an ftp server which "closes the connection when USER, PASS, or HELP is given with a too long argument." It says "This is probably due to a buffer overflow" Is this a false positive? Or is this something to actually be concerned about? -- Isn't it nice that people who prefer Los Angeles to San Francisco live there? -- Herb Caen