Synopsis :

According to a third-party database, the remote host is listed as
part of a botnet.

Description :

The remote host is listed in a public database as part of a botnet.
This means it has been infected and is used to attack third party
hosts and/or conduct illicit activities.

See also :

https://support.tenable.com/support-center/index.php?x=&mod_id=2&id=518

Solution :

Reinstall the remote system from scratch

Risk factor :

High / CVSS Base Score : 9.3
(CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 6.9
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false