Libwww-perl Access Test and vulnerabilities ?

Way out of my depth here !

Doing some work on site optimization
(on my shoppingcart theme site)

And one of the key items to focus on was

“Your server appears to allow access from User-agent Libwww-perl. Botnet scripts that automatically look for vulnerabilities in your software are sometimes identified as User-Agent libwww-perl. By blocking access from libwww-perl you can eliminate many simple

In order to pass this test you must block the libwww-perl user-agent in your .htaccess file.
If your site is running on apache server, you could put these lines in your .htaccess after RewriteEngine on line:

RewriteCond %{HTTP_USER_AGENT} libwww-perl.*
RewriteRule .* – [F,L]

Does anyone know
is it something I need to worry about
(or can I just ignore it) ??