awstats.cgi in AWStats before 7.0 accepts a configdir parameter in the URL, which allows remote attackers to execute arbitrary commands via a crafted configuration file located on a (1) WebDAV server or (2) NFS server.
The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.